Twmpa
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| Twmpa | |
|---|---|
| Elevation | 689 m (2,231 ft) |
| Location | Powys, |
| Range | Black Mountains |
| Prominence | 79 m |
| Parent peak | Waun Fach |
| Topo map | OS Landranger 161 |
| OS grid reference | SO224350 |
| Listing | Hewitt, Nuttall |
Twmpa or Lord Hereford's Knob is a mountain in South-east Wales, one of the furthest north of the Black Mountains. It lies 3km west of the border with England, and around 7km south of Hay-on-Wye.

