Hatterrall Hill (Welsh: Mynydd Y Gader) is a rounded peak in the Black Mountains which sits on the Wales-England border, partly in Monmouthshire, Wales and partly in Herefordshire, England. Its summit at 531m is the high point of a peaty plateau which falls away steeply on all sides. Broad ridges run to the north, the southeast and southwest. To the north the ridge (known as Hatterrall Ridge) dips to a col at around 485m elevation before rising gradually over several kilometres towards Crib y Garth / Black Hill and Hay Bluff. The ridge to the southwest ends abruptly at the sheer cliff known as the Darren below which is a considerable landslip area extending south to the hamlet of Cwmyoy with its mis-shapen church.
The Welsh part of the hill falls within the Brecon Beacons National Park.
There's a trail leading to the summit.
By elevation Hatterrall Hill is
# 6 out of 196 in Herefordshire # 86 out of 172 in Brecon Beacons National Park # 8 out of 74 in Monmouthshire
By prominence Hatterrall Hill is
# 53 out of 196 in Herefordshire # 46 out of 172 in Brecon Beacons National Park # 17 out of 74 in Monmouthshire
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