| Pen Twyn Glas | |
|---|---|
 | |
| 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 |
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.
The summit is merely a grassy bump on the ridge marked by a pile of stones.[1]
- ^ Nuttall, John & Anne (1999). The Mountains of England & Wales - Volume 1: Wales (2nd edition ed.). Milnthorpe, Cumbria: Cicerone. ISBN 1-85284-304-7.