Pen Twyn Glas is a top of Pen Allt-mawr in the Black Mountains in south-eastern Wales. It lies in between Pen Allt-mawr and Mynydd Llysiau.

Pen Twyn Glas
Pen Twyn Glas, Mynydd Llysiau and Waun Fach from Pen Allt-mawr
Highest point
Elevation	646 m (2,119 ft)
Prominence	21 m (69 ft)
Parent peak	Pen Allt-mawr
Listing	sub Hewitt, Nuttall
Naming
Language of name	Welsh
Geography
Location	Black Mountains, South Wales
OS grid	SO215300
Topo map	OS Landranger 161

The summit is merely a grassy bump on the ridge marked by a pile of stones.[1]

References

External links

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