Carreg Dwfn

Carreg Dwfn (also referred to as Careg Dwfn and Carregydwfn and referred to also as Careg-y-dwfan[1] ) is a hill four miles southeast of Llandeilo and just to the south of the village of Trap in the county of Carmarthenshire, south Wales.

It lies at the western extremity of the Brecon Beacons National Park and Fforest Fawr Geopark.

[2] The hill is formed from the coarse Twrch Sandstone (formerly known as the Basal Grit) laid down during the Namurian stage of the Carboniferous period.

Quarrying rights at these sites were stopped by the Brecon Beacons National Park Authority in 2008.

[4] To its north is the large Craigyrodyn Quarry which worked the Carboniferous Limestone outcrop which parallels the narrow band of Twrch Sandstone running west to east through the region.