| Pen Twyn Glas | |
|---|---|
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| Highest point | |
| Elevation | 646 m (2,119 ft) |
| Prominence | 21 m (69 ft) |
| Parent peak | Pen Allt-mawr |
| Listing | sub Hewitt, Nuttall |
| 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.
Coordinates: 51°57′47″N 3°08′38″W / 51.96292°N 3.14392°W