Black Mountain (hill)

Infobox Mountain
Name = Black Mountain
Photo = Black Mountain Top.jpg
Caption = The summit, crossed by the Offa's Dyke Path
Elevation = 703 m (2,306 ft)
Location = Herefordshire, ENG / Powys, WAL
Range = Black Mountains
Prominence = 154 m
Parent peak = Waun Fach
Coordinates =
Topographic
OS "Landranger" 161
Easiest route = The Cat's back
Grid_ref_UK = SO255350
Listing = Marilyn, Hewitt, County Top, Nuttall

Black Mountain ( _cy. Mynydd Ddu) is a mountain in the Black Mountains (not to be confused with the Black Mountain range of hills). It is the only Marilyn to fall exactly on the Welsh-English border, straddling Powys and Herefordshire.

Offa's Dyke long distance footpath passes along the ridge, more or less from south to north (or vice versa), while a steeper path leads to the summit from near the youth hostel in the Vale of Ewyas to the west. The summit is unmarked and, because of the very shallow gradients along the summit ridge, virtually impossible to determine "in situ."

It is the highest ground in England south of the Yorkshire Dales, even though higher neighbours are very close by in Wales.