Sunday 5 May 2019

Mapping Mountains – Trimble Surveys – Mynydd Twr


28.10.18  Mynydd Eilian (SH 472 917)  

Mynydd Eilian (SH 472 917)

My month long stay in Nantlle roaming the hills of Eryri and Ynys Môn was coming to an end, and I had just one last hill I wanted to visit; Mynydd Eilian.  As well as this hill being one of the farthest northerly P30s in the country its map height was of interest, as it has a 177m spot height on contemporary Ordnance Survey maps, with its near neighbour of Yr Arwydd (whose summit I had just surveyed) and its map height of 178m being recognised as the highest point on Ynys Môn, with the caveat that Mynydd Twr is higher, but this is on the separate island of Ynys Gybi.

By the time I had found a convenient parking place just to the north-west of the upper part of the hill, the late afternoon was illuminated with autumnal sunshine as the sun sank forever lower and the land bathed in its glow.

It was only a short walk on the narrow lane to where a public footpath sign indicates where one of the paths leading up Mynydd Eilian is situated.  This signpost was swamped in dulled brown bracken and led to a stone foot style constructed in to a wall.

The way to the hill

From here to the summit of the hill proved a delight with a green path making its way up beside hillsides scattered in gorse.  Three ponies grazed in an adjacent field, all seemed quiet, with the flow of the northerly coast disappearing westward and just the beating of waves in the sea below accentuating the scene with any form of movement.

The north Wales coast of Ynys Môn

The green path led all the way to this hill’s trig pillar which is perched at its summit in a slight hollow with the remnants of an old cairn strewn beside and around it.  I spent a number of minutes examining the remains of the old cairn for any rock that could be thought of as being embedded, and having decided that grass beside the base of and about one metre from the trig pillar was the highest part of the hill, I positioned the Trimble on top of my rucksack, measured the offset between its internal antenna and the ground below and stood back as it gathered its allotted data.

Gathering data at the summit of Mynydd Eilian

It was a pleasure to be on top of Mynydd Eilian, it proved a wonderful viewpoint with the northern coast plunging below and the whole of Ynys Môn disappearing in to the higher peaks of Eryri to the south, and once data were gathered and stored I bade my farewells to the hill and started my descent.

The Trimble set-up position at the summit of Mynydd Eilian

Heading down the hill I came across a family on their way up, mother, father and daughter.  They were on holiday in a caravan and we talked about how wonderful the weather was and their impending trip to North and South Stack tomorrow.  I asked where they lived and smiled at their reply ‘in Shropshire, between Shrewsbury and Oswestry,’ I laughed and told them that I lived in Welshpool, on occasion tis a very small world indeed.  Waving my goodbye’s it was only a short walk down the continuation of the green path to the narrow lane below and onward to my car.

It had been a good month spent in this part of Wales with 40 P30s visited and surveyed, and place-name enquiries made with a number of people who I had visited resulting in 16 names of hills either confirmed through historic and / or local research.



Survey Result:



Mynydd Eilian 

Summit Height:  176.9m (converted to OSGM15, Trimble GeoXH 6000) (confirmed as lower than Yr Arwydd [SH 47242 85417])

Summit Grid Reference:  SH 47282 91719 (Trimble GeoXH 6000)

Bwlch Height: 53.3m (LIDAR)

Bwlch Grid Reference:  SH 42808 86451 (LIDAR)

Drop:  123.6m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  69.86% (Trimble GeoXH 6000 summit and LIDAR bwlch)






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