The highest points of both Torfaen and Blaenau Gwent unitary authorities are at the summit of Coity Mountain.

Some 2 km (1 mi) to the southeast lies a major subsidiary top of the hill, Mynydd Varteg Fawr (549m) at the southeastern end of whose broad ridge is a trig point at 544m.

There are areas of peat and accumulations of head and many small landslips adorn its steeper slopes.

There are in addition a number of vehicular tracks and smaller paths which run both around its flanks and along its broad main ridge.

Most of the mountain is access land under the Countryside and Rights of Way Act 2000 and can be freely traversed on foot.