Banc Du

Banc Du is a prominent, fairly flat-topped southwards-projecting promontory of Foel Eryr, at about 334m OD at the west end of the Preseli Hills in north Pembrokeshire, Wales. First spotted in July 1990 during an aerial photographic survey of the region, this hilltop enclosure consists of two non-concentric and incomplete earthworks that define a roughly oval area around the hilltop, amidst a series of cultivation features and abandoned trackways.

There is a crag-line on the south-east side and steep slopes to the south and west. It overlooks the source of the Afon Syfynwy to the south-east, and afford extensive views to the south and west. Neither upland not lowland, Banc Du occupies a curious position between enclosed fields and open moor, clearly cultivated in the past, but now maintained as improved pasture for grazing sheep.