Pen Allt-mawr

Pen Allt-mawr is subsidiary summit of Waun Fach and the third highest peak in the Black Mountains in south-eastern Wales. It lies near the end of the westernmost of Waun Fach's south ridges. It is a very recognisable and prominent peak of the Black Mountains. It summit is stony and has a large shelter cairn. Its top Pen Twyn Glas is to the north, while its close neighbour Pen Cerrig-calch is to the south.