The Black Mountains (Welsh: Y Mynyddoedd Duon) are a group of hills spread across parts of Powys and Monmouthshire in southeast Wales, and extending across the national border into Herefordshire, England. They are the easternmost of the four ranges of hills that comprise the Brecon Beacons National Park, and are frequently confused with the westernmost, which is known as the Black Mountain. To confuse matters further, there is a peak in the Black Mountains called Black Mountain.
St.234228 walk through farm and follow signs up ridge to Pen Twyn Glas (645)follow track to Mynydd Llysiau (662) then to Pen Trumau (707) then Waun Fach (811) Pen y Gadair Fawr (800) then to Pen Twyn Mawr (658) before heading down off ridge to Nantyrychain & then follow road back to start point.
