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Google Earth view of the contested ridge.
Border skirmish - Amateur cartologist discovers part of Wales should actually be in England.
A hillwalker has discovered that the border between England and Wales has been incorrectly marked for decades - and that England should be given more land.
Myrddyn Phillips said the official border between the two countries in the Black Mountains south of Hay-on-Wye has been wrongly traced on the Ordnance Survey maps.
The current border should follow the natural watershed from the summit of Twyn Llech on the nine mile long Hatterrall Ridge in the remote area.
But intrepid Mr Phillips and his rambling partner Mark Trengove have remeasured the summit of the 2,308ft mountain - and found it to be 12m further west than previously thought.
Although 12 metres is a seemingly small discrepancy, the area amounts to 1.8 million square feet along the entirety of the ridge.