| Also known as: | Mynydd Twyn-glas |
| Area: | Neath to Chepstow |
| County: | Caerphilly/Torfaen |
| Country: | Wales |
| Classification: | Marilyn and HuMP (also Clem and Tump) |
| Height: | |
| Maps: | 152 Explorer or 171 Landranger |
| Grid Ref: | ST259978 Hills nearby: 5km 10km 20km |
| Summit: | knoll 35m N of trig point |
| Notes: | knoll is 50cm higher than base of trig point; knoll 30m WNW of trig point is 30cm higher; trig point is at ST 25996 97816 |
| Daylight: | dawn 04:05, sunrise 04:53, sunset 21:33, dusk 22:21 |
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2 other walkers registered on our site have already walked up this hill including: mbatt and ThinArthur.