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.

Pen Twyn Mawr
Pen y Gadair Fawr from the summit of Pen Twyn Mawr
Highest point
Elevation	658 m (2,159 ft)
Prominence	17 m (56 ft)
Parent peak	Pen y Gadair Fawr
Listing	Nuttall
Naming
Language of name	Welsh
Geography
Location	Black Mountains, South Wales
OS grid	SO241266
Topo map	OS Landranger 161

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.[1]

References

External links

• www.geograph.co.uk : photos of Waun Fach and surrounding area