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Bwlch Mawr
Highest point
Elevation 510 m (1,670 ft)
Prominence 145 m (476 ft)
Listing HuMP, Sub-Marilyn
English translation big pass
Language of name Welsh
Location Gwynedd, Wales
OS grid SH 427478
Topo map OS Landranger 123 / Explorer 254

Bwlch Mawr is a hill near the northeastern corner of the Llŷn Peninsula in the community of Clynnog in the county of Gwynedd in North Wales.

Its name is an odd one for a hill, as it means "big pass" in English. It forms the eastern half of a wider upland area, the highest point of which is the 522 m summit of Gyrn Ddu, though it is Bwlch Mawr on which the Ordnance Survey constructed a trig point.


In common with a number of other isolated hills in Llŷn, Bwlch Mawr is formed by an igneous intrusion of Palaeozoic age.


A single public footpath crosses the southern flanks of the hill but the upper parts of Bwlch Mawr are designated as open country under the Countryside and Rights of Way Act 2000 and therefore freely available to walkers. In the northwest a bridleway runs south from the village of Clynnog-fawr to the edge of open country.

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