Hay Bluff (Welsh: Penybegwn) is a prominent hill at the northern tip of the Black Mountains, an extensive upland massif which straddles the border between south-east Wales and England. The mountain sits at the point where the main northeast-facing escarpment of the Black Mountains meets the northwest facing escarpment, the next peak to the west being Twmpa. The flat summit of Hay Bluff which is marked by a triangulation pillar at a height of 677 metres (2,221 ft) overlooks the middle Wye Valley and the book town of Hay-on-Wye.
The hill is largely within the Welsh county of Powys though parts of its eastern flanks lie within the English county of Herefordshire. In 2024 a monolith similar to the one in Utah was found atop the hill. It is unknown who placed it there or for what purpose.
There's a trail leading to the summit.
By elevation Hay Bluff is
# 45 out of 930 in Powys # 33 out of 172 in Brecon Beacons National Park
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