Pen Twyn Mawr is a top of Pen y Gadair Fawr in the Black Mountains in south-eastern Wales. It lies on one of the many south ridges of Waun Fach.
The summit is marked by a pile of stones in an area of sandy soil and heather. Pen y Gadair Fawr is to the north, Chwarel y Fan to the east and Pen Allt-mawr to the west.
There's a trail leading to the summit.
By elevation Pen Twyn Mawr is
# 55 out of 930 in Powys # 38 out of 172 in Brecon Beacons National Park
We use GPS information embedded into the photo when it is available.
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