Mynydd Hendre-ddu or Mynydd Hendreddu is a mountain in southern Snowdonia, Wales. It is one of a line of mountains running from Mynydd Dolgoed in the north, through Mynydd Llwydiarth to Mynydd Hendre-ddu and on to Mynydd y Foel, Y Grug, Mynydd Tri-Arglwyd and Mynydd Gwyn to the south of the village of Aberangell. It forms the watershed between Nant Llwydiarth, which flows to the south-west and into the Afon Dulas, and streams flowing into Afon Angell to the north, which flow east into the River Dyfi.[2]

Mynydd Hendre-ddu
Road on the flank of Mynydd Hendre-ddu
Highest point
Elevation	379.5 m (1,245 ft)[1]
Listing	Hendre-ddu mountain
Naming
Language of name	Welsh
Geography
Location	Gwynedd, UK
Parent range	Snowdonia

The summit is notable for a set of parallel ridges about 80 centimetres (31 in) across and 130 metres (430 ft) long that run across it.[2]

On the northern slope of the mountain lay the Hendre Ddu slate quarry which was connected to Aberangell by the Hendre-Ddu Tramway.

Mynydd Hendre-ddu is one of the Dyfi hills.

References