Foel Chwern is a Round cairn on the edge of the high plateau east of the Neath valley, and near the summit of Craig y Llyn.

It is a burial monument dating to the Bronze Age, and is sited on the edge of a steep scarp slope, with a wide field of view to the north.

The visible ones appear to be slabs of the locally occurring sandstone, although much of the mound is grass covered, so most stones are obscured and the edge is very indistinct.

[3] It is part of the Rheola Forest, which occupies a large area to the east of the Neath valley, above Cwmgwrach, planted with spruce and larch by the Forestry Commission in the mid 20th century.

The long-distance Coed Morgannwg Way runs east-west from there along the scarp, immediately past the cairn before turning south to Cwm Afon.