Hill Lists – Cymru / Wales – 200m Twmpau updates – Bryniau Cymoedd

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification. 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Thirty Second and last Group is Bryniau Cymoedd.

Bryniau Cymoedd

North from the sea at ST 194 721 following the Afon Elái (Ely River) to ST 030 812, the Nant Melyn towards bwlch at ST 007 830, the Ewenni Fach to SS 954 799, the Afon Ewenni (Ewenny River) to SS 878 767 and the Afon Ogwr (Ogmore River) to the sea at SS 855 757, continuing east from the sea at SS 666 917 following the Afon Tawe to SN 723 036, the Upper Clydach River to bwlch at SN 698 094 and the Garnant to SN 686 133, continuing south of the Afon Aman (River Amman) to bwlch at SN 739 135, the Afon Twrch to SN 771 083, the Afon Tawe to SN 834 127, the Nant Llech to bwlch at SN 844 107, the Afon Pyrddin to SN 898 091, the Afon Nedd (River Neath) to SN 902 074 and the Afon Mellte to SN 910 079, continuing south of the Sychryd and Camnant to bwlch at SN 942 062 and the Afon Cynon to SN 988 046, and the Nant y Gwyddel to bwlch at SO 005 073 and following stream to SO 030 076, the Taf Fawr to SO 046 062, the Nant Moriais to bwlch at SO 082 086, and bwlch at SO 119 101, and bwlch at SO 147 115, and bwlch at SO 174 115, and bwlch at SO 192 115, and the River Clydach to SO 242 154, and the Afon Wysg (River Usk) to the sea at ST 323 813.  Bordering with Y Mynydd Du, Fforest Fawr, Bannau Brycheiniog and Y Mynyddoedd Duon to the north, Coed Gwent to the east, the sea and Bro Morgannwg to the south and Penlle’rcastell to the west. 

             

Twmpau - 200m updates

Pt. 245m    245m    SN 721 059

This hill was originally listed under the name of Cefn Llan, which had been taken from buildings to the west of the summit, as the blog author does not know an appropriate name for the hill it is reverting to the Pt. notation.  The summit height is taken from a 245m trig pillar, and the bwlch height is taken from a 214m spot height that appears on the Ordnance Survey enlarged Geograph map.  These values give this hill 31m of drop and therefore the hill is promoted from the Sub-List.

Sub-Twmpau - 200m updates

Pt. 209m    209m    SN 714 013

The Pt notation is being used for the name of this hill as it seems two names that appear near to this hill’s summit on the map; Graig Ola and Craig-y-perchyll may be applicable to buildings and not the hill.  This is a another hill that benefits from the Ordnance Survey enlarged Geograph map, as the bwlch has a 184m spot height on it on this map, and with a summit spot height of 209m, this hill enters the Sub-List with 25m of drop.

Mynydd Portref    277m    SS 993 856

This hill has a summit spot height of 277m and bwlch contouring between c 250m – c 255m, with the height of the bwlch estimated as c 252m, giving this hill c 25m of drop.

Pt. c 241m    c 241m    ST 166 968

The summit of this hill is situated in the town of Coed-duon (Blackwood) and its height has been estimated as c 241m from an uppermost contour of c 240m.  The area of its bwlch has a 216m spot height on it that appears on the Ordnance Survey enlarged Geograph map, these values give this hill c 25m of drop.

Craig y Merchant    213m    ST 252 910

With a summit spot height of 213m and a bwlch spot height of 191m, this hill enters the Sub-List with a drop of 22m.  The bwlch spot height comes from the Ordnance Survey 1:50,000 map, although the actual spot is hard to distinguish where it is placed.

Coedyprior Common    297m    SO 293 103

The name of Coedyprior Common appears on the Ordnance Survey enlarged Geograph map and has been chosen as this hill’s designated name, whilst the Ordnance Survey 1:25,000 and 1:50,000 scale maps have the name of the hill as Coed-y-Prior Field.  The hill enters the Sub-List as it has 21m of drop based on a summit spot height of 297m and a bwlch spot height of 276m.

Parc Penallta    235m    ST 136 953

Parc Penallta has a large landscaped figure of a pit pony at its summit, a must visit Sub-Hill!  The summit has a 235m spot height that appears on the Ordnance Survey enlarged Geograph map, and the bwlch height has been estimated as c 214m high based on bwlch contouring between c 210m – c 220m, these values give this hill c 21m of drop.

Pt. 223m    223m    SN 800 079

This hill’s name is listed under the Pt notation as the blog author does not know an appropriate name for it.  The area of the bwlch has three different spot heights on it; 208m at SN 803 084, 203m at SN 802 082 and 202m at SN 803 086, the latter two appearing on the Ordnance Survey enlarged Geograph map.  The 202m spot height has been taken as the height of the bwlch, which gives this hill 21m of drop.

Twynau Gwynion    229m    ST 152 834

The Ordnance Survey enlarged Geograph map gives a 208m spot height on the area of this hill’s bwlch at ST 15422 84045, whilst the 1:25,000 map has a 209m spot height placed at ST 15445 84070, as the latter is more centralised on the valley to valley traverse this hill is included in the Sub-List with 20m of drop.

Coed Mawr    214m    ST 246 887

With a summit spot height of 214m and a bwlch spot height placed at ST 237 891 of 194m, this hill enters the Sub-List with 20m of drop.

Pt. 275m    275m    ST 192 978

Another hill that follows the Pt notation as the blog author does not know a suitable name for it.  The summit area has a 274m trig pillar on it with Ordnance Survey 1:25,000 and 1:50,000 scale maps giving a separate spot height of 275m near to the trig, the bwlch contouring is between c 250m – c 260m and the height of the bwlch has been estimated as c 255m, giving this hill c 20m of drop.

This now completes the updates to the 200m Twmpau List

Hill Lists – Cymru / Wales – 200m Twmpau updates – Coed Gwent

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification. 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Thirty First Group is Coed Gwent.

Coed Gwent

East from the sea at ST 323 813 following the Afon Wysg (River Usk) to SO 359 092, continuing south of the Clawdd Brook to bwlch at SO 396 129, continuing east of the Nant y Deri to SO 401 146, continuing south of the Afon Troddi (River Trothy) to SO 515 116, continuing west of the Afon Gwy (River Wye) to the sea at ST 541 901.  Bordering with Y Mynyddoedd Duon to the north, Bryniau Cymoedd to the west, the sea to the south and the border with England to the east. 

Twmpau - 200m updates

Pt. 277m    277m    ST 485 990

This hill was always a prime candidate for promotion from the Sub-List as it has a 277m summit spot height, and bwlch contouring between c 245m – c 250m, with the height of the bwlch estimated as c 247m, giving this hill c 30m of drop.  The hill was originally listed under the part invented name of Devauden Hill; it now reverts to the Pt notation as the blog author does not know an appropriate name for it.

Pt. 232m    232m    SO 518 106

This hill has been promoted from the Sub-List as it has a summit spot height of 232m and an estimated bwlch height of c 202m, based on bwlch contouring between c 200m – c 205m, giving this hill c 30m of drop.  It was originally listed as Troypark Wood Top which was partly based on the name of the wood to the west of the summit, as this wood does not take in the high point the name has been amended to the Pt notation as the blog author does not know an appropriate name for it.  The name of Church Hill Common also appears on the lower south-easterly slope of this hill on Ordnance Survey maps, as this name may just apply to a piece of bounded land and not to the hill itself, it has not been used.

Sub-Twmpau - 200m updates

Trelleck Hill    c 288m    SO 506 064

This hill has an uppermost ring contour of c 285m and its height has been estimated as c 288m, the area of the bwlch has a 261m spot height on the Ordnance Survey enlarged Geograph map at SO 510 057, although the positioning of this spot height is not centred on the hill to hill traverse, contouring suggests it may be positioned near to the critical bwlch, therefore this hill enters the Sub-List with c 27m of drop.

Gaer Hill    264m    ST 516 981

Another hill whose drop value is dependent upon the Ordnance Survey enlarged Geograph map as both summit and bwlch are spot heighted.  The former has a 264m spot height and the latter a 239m spot height, giving this hill a drop of 25m.

Pt. 244m    244m    ST 435 974

This hill follows the Pt. notation for its name as no suitable name is known for it by the blog author.  The bwlch contouring is between c 220m – c 225m, with the height of the bwlch estimated as c 222m and placed at ST 433 972, giving this hill c 22m of drop.

Next update due on the 17^th November 2014

Hill Lists – Cymru / Wales – 200m Twmpau update - Bannau Brycheiniog

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification.

 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Thirtieth Group is Bannau Brycheiniog.

Bannau Brycheiniog

West and then north from SO 242 154 following the River Clydach to bwlch at SO 192 115, and bwlch at SO 174 115, and bwlch at SO 147 115, and bwlch at SO 119 101, and bwlch at SO 082 086 towards the Nant Moriais to SO 046 062, continuing east of the Taf Fawr to the Llwyn-on Reservoir at SO 012 114 and from SO 004 128 to the Cantref Reservoir at SN 996 153 and from SN 992 163 to the Beacons Reservoir at SN 989 183 and the Blaen Taf Fawr from SN 986 190 to SN 987 194 and stream to bwlch at SN 982 203 and the Afon Tarell to SO 038 288, continuing south of the Afon Wysg (River Usk) to SO 242 154.  Bordering with Y Mynyddoedd Duon and Mynydd Epynt to the north, Fforest Fawr to the west, Bryniau Cymoedd to the south and Y Mynyddoedd Duon to the east. 

   

Twmpau - 200m updates

Cefn Cantref    293m    SO 048 269

This hill has been promoted from the Sub-List as the given drop is 30m, based on the hill having a twin 293m summit and a 263m spot height at the bwlch, with the latter appearing on the Ordnance Survey enlarged Geograph map.  The summit at SO 048 269 has a triangulation pillar on it with a flush bracket height of 293.223m, meaning ground at the immediate base of the trig is likely to be just under 293m high, but as ground adjacent to the base of the trig looks slightly higher the hill retains its twin summit status, for now!  The other summit is positioned at SO 049 262.

Next update due on the 10^th November 2014

Hill Lists – Cymru / Wales – 200m Twmpau update – Fforest Fawr

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification. 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Twenty Ninth Group is Fforest Fawr.

Fforest Fawr

North from SO 030 076 following stream to bwlch at SO 005 073 and the Nant y Gwyddel to SN 988 046, continuing north of the Afon Cynon to bwlch at SN 942 062 and the Camnant and Sychryd to SN 910 079, and the Afon Mellte to SN 902 074, continuing north of the Afon Nedd (River Neath) to SN 898 091 and the Afon Pyrddin to bwlch at SN 844 107 and the Nant Llech to SN 834 127, continuing east of the Afon Tawe to SN 848 172 and the Nant Tywynni to bwlch at SN 870 195 and the Blaen-crai to the Cray Reservoir at SN 877 207, continuing east from SN 883 220 following the Afon Crai to SN 901 290, continuing south of the Afon Wysg (River Usk) to SO 038 288, continuing west of the Afon Tarell to bwlch at SN 982 203 and stream to SN 987 194 and the Blaen Taf Fawr to the Beacons Reservoir at SN 986 190, continuing west from SN 989 183 following the Taf Fawr to the Cantref Reservoir at SN 992 163 and from SN 996 153 to the Llwyn-on Reservoir at SO 004 128, continuing following the Taf Fawr from SO 012 114 to SO 030 076.  Bordering with Mynydd Epynt to the north, Y Mynydd Du to the west, Bryniau Cymoedd to the south and Bannau Brycheiniog to the east.  

         

Sub-Twmpau - 200m updates

Pt. 293m    293m    SN 941 290

The name of this hill follows the Pt. notation as the blog author does not know an appropriate name for it.  The summit has a 293m spot height on it, and bwlch contouring is between c 270m – c 280m, with the bwlch height estimated as c 273m high, these values give this hill c 20m of drop.

Next update due on the 3^rd November 2014

Hill Lists – Cymru / Wales – 200m Twmpau update – Y Mynydd Du

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification.

 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Twenty Eighth Group is Y Mynydd Du.

Y Mynydd Du

North from SN 834 127 following the Afon Tawe to SN 771 083 and the Afon Twrch to bwlch at SN 739 135, continuing north of the Afon Aman (River Amman) to SN 622 105, continuing east of the Afon Llwchwr (River Loughor) to SN 622 132 and the Afon Marlas to bwlch at SN 620 178 and the Afon Cennen to SN 632 218, continuing south of the Afon Tywi (River Towy) to SN 753 327 and the Afon Bran to SN 770 342, continuing south of the Afon Gwydderig to bwlch at SN 871 299 and the Nant Logyn to SN 883 288 and the Afon Wysg (River Usk) to SN 901 290, continuing west of the Afon Crai to the Cray Reservoir at SN 883 220, continuing from SN 877 207 following the Blaen-crai to bwlch at SN 870 195 and the Nant Tywynni to the Afon Tawe (River Tawe) at SN 848 172 to SN 834 127.  Bordering with Mynydd Epynt to the north, Elenydd and Mynydd Sylen to the west, Penlle’ rcastell and Bryniau Cymoedd to the south and Fforest Fawr to the east.

    

Twmpau - 200m updates

Pen y Lan    268m    SN 663 206

This hill was always a prime candidate for promotion from the Sub-List as it has a 268m summit spot height, and bwlch contouring between c 230m – c 240m, with the height of the bwlch estimated as c 235m, giving this hill c 33m of drop.  The Ordnance Survey enlarged Geograph map has two 238m spot heights on the area of the bwlch, one is on a road at SN 667 210, the other is at SN 672 210, both are considered not to be placed at the critical bwlch.

Pt. 238m    238m    SN 672 232

Another hill that is promoted from the Sub-List and one whose name reverts to the Pt. notation, as it was previously listed as Maesydderwen, which is a name that was taken from buildings to the west of the summit.  As the height of the bwlch has been estimated as c 203m high, based on bwlch contouring between c 200m – c 210m, it gives this hill c 35m of drop.

Pt. 238m    238m    SN 795 343

This hill appeared in the original Sub-List under a part invented name of Twyn y Gwerddon, this was based on the name of buildings eastward of the summit, it now reverts to the Pt. notation for this list as the blog author does not know an appropriate name for it.  The bwlch contouring is between c 200m – c 210m, with the height of the bwlch estimated to be c 208m at SN 796 330, giving this hill c 30m of drop.  As of writing it is another P30 hill that does not appear in the TuMPs list.

Sub-Twmpau - 200m updates

Allt Llwynmeredydd    219m    SN 758 302

This hill has bwlch contouring between c 190m – c 200m, with the bwlch height estimated as c 196m at SN 757 299.  The 219m summit and c 196m bwlch values give this hill c 23m of drop.

Pt. 208m    208m    SN 645 171

Another hill name that follows the Pt. notation as the blog author does not know an appropriate name for it.  The Ordnance Survey enlarged Geograph map has a 186m spot height on the bwlch at SN 646 171, giving this hill 22m of drop.

Pt. 259m    259m    SN 893 286

This hill follows the Pt. notation for its name as no suitable name is known for it by the blog author.  The bwlch contouring is between c 230m – c 240m, with the height of the bwlch estimated as c 237m and placed at SN 887 282, giving this hill c 22m of drop.

Allt Cwmnantybeudy    254m    SN 793 304

With a summit spot height of 254m and an estimated bwlch height of c 233m, based on bwlch contouring between c 230m – c 240m, this hill has c 21m of drop.

Next update due on the 27^th October 2014

Hill Lists – Cymru / Wales – 200m Twmpau updates – Penlle’ rcastell

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification.

 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Twenty Seventh Group is Penlle’ rcastell.

Penlle’ rcastell

 

North and then east from SS 620 907 following the Clyne River to bwlch at SS 595 939 and the Gors Fawr Brook to SS 592 967, continuing north of the Afon Llan to the sea at SS 560 979, continuing east of the Afon Llwchwr (River Loughor) to SN 622 105, continuing south of the Afon Aman to SN 686 133, continuing west of the Garnant to bwlch at SN 698 094 and the Upper Clydach River to SN 723 036, continuing west of the Afon Tawe to the sea at SS 666 917.  Bordering with the Gŵyr and Mynydd Sylen to the west, Y Mynydd Du to the north, Bryniau Cymoedd to the east and the sea to the south.     

Sub-Twmpau - 200m updates

Pt. 299m    299m    SN 696 058

This hill is a new entry in to the Welsh 200m P30 Sub-List, however its entry is contentious as Ordnance Survey mapping suggests this hill exists due to spoil heaps from old mining.  To include a hill in a list because its existence is due to man’s recent incursion is difficult, but as current Ordnance Survey maps give this hill continuous contour lines it suggests that the hill is permanent in nature and as it exists it would be difficult to not include it.  Subjectivity would also have to be taken in to account as to be considered permanent in nature the hill would ideally need to be landscaped and not comprise just spoil waste.  The Ordnance Survey enlarged Geograph map gives this hill a 299m summit spot height, and bwlch contouring is between c 270m – c 280m and the bwlch has been estimated as being c 275m high, these values give the hill c 24m of drop.

Next update due on the 20^th October 2014

Hill Lists – Cymru / Wales – 200m Twmpau updates – Mynydd Sylen

The first list to the Welsh 200m P30 hills was published on Geoff Crowder’s website v-g.me in 2000; this list preceded the list of TuMPs by nine years, the list proved a very useful resource for the TuMP compilation for this category of hill.

The Welsh 200m P30 list documents all hills in Wales that are at or above 200m in height and are below 300m in height, to qualify for the main list each hill requires a minimum of 30m of prominence.

The hills listed below are updates to the Welsh 200m P30 list originally published on Geoff Crowder's website.  To see the original list click {here}

The original published list had a Sub-List which was entitled ‘Hills to Survey’.  This list consisted of all hills in Wales in the stipulated height band that have a minimum of 20m of prominence, but do not meet the minimum 30m of prominence to enter the main list, according to Ordnance Survey map spot heights and contours.  Nowadays the standard Sub-List takes in all hills that have a minimum of 20m of prominence.  However, the Hills to Survey Sub-List discounted hills whose map spot heights gave a drop value of less than 30m, but more than 20m.  By doing so, the only hills that were Sub-Listed were those that map values dictated stood a chance of entering the main list, for example; if a hill had a summit spot height of 250m and a bwlch spot height of 221m, it was not listed in the Hills to Survey Sub-List as with 29m of drop I thought it did not stand a chance of main list qualification. 

When compiling the Sub-List I was measuring many hills for P30 status using a basic levelling technique, please click {here} for more information concerning this.  I now know that Ordnance Survey spot heights have a standard margin of uncertainty of + / - 3m associated with their accuracy.  Therefore many hills that were not listed in the original Sub-List may have sufficient drop to enter the main list.  Because of this the Sub-List has been altered to include all hills that have a minimum of 20m of drop but are not known to attain the minimum 30m of drop to enter the main list.

The hills listed below are those major amendments to the original Welsh 200m P30 list as it appears on Geoff’s website.  There are many hills that have been promoted from the Hills to Survey Sub-List to the main list, whilst there are many additions to the Sub-List now that it has been standardised to include all 20m minimum but below 30m drop hills.

When the 200m P30 list was first published it was the first to this category of hills and in some way it and its other 100m height band lists paved the way for Clem’s data that later appeared on the RHB file database and then for the TuMPs listing by Mark Jackson.

As well as the first P30 list to this height band the list is now the first to include a comprehensive Sub-List.

TuMP baggers beware; as the main list also includes P30’s not listed by Mark Jackson, so if you want to visit all P30’s you’ll have to include some non TuMPs to do so.

The list will be updated on a weekly basis and will be done so through each Group category, starting from the north and working south.  The Twenty Sixth Group is Mynydd Sylen.

Mynydd Sylen

East and then south from the Afon Tywi at SN 343 066 to SN 632 218, continuing west of the Afon Cennen to bwlch at SN 620 178 and the Afon Marlas to SN 622 132, continuing west of the Afon Llwchwr (River Loughor) to the sea at SS 560 979.  Bordering with Pen y Moelfre to the west, Moelfre and Elenydd to the north, Y Mynydd Du and Penlle’rcastell to the east and the sea to the south.

Twmpau - 200m updates

Pt. 227m    227m    SN 547 121

This hill was originally listed as a twin top in the Sub-List, the hill at SN 538 110 remains in the Sub-List with c 25m of drop, whilst the hill at SN 547 121 is promoted to the main P30 list.  This hill was originally listed under a part invented name of Tumble Hill, it is now reverting to the Pt. notation as the blog author does not know an appropriate name for it.  It is promoted to the P30 list as the Ordnance Survey enlarged Geograph map gives the summit a spot height of 227m and as Ordnance Survey maps give a 197m spot height at the bwlch, these values give this hill 30m of drop.

Mynydd Cerrig    c 208m    SN 500 136

This could be viewed as a contentious promotion from the Sub-List as both summit and bwlch heights are reliant upon contour interpolation.  The summit height has been estimated as c 208m based on the highest continuous contour of c 205m, whilst the bwlch contouring is between c 175m – c 180m and has been estimated as being c 177m high, these values give this hill c 31m of drop.

   

Next update due on the 13^th October 2014