Carreg Dwfn (also referred to as Careg Dwfn and Carregydwfn) 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. Its summit at 283 metres (928 ft) is towards the eastern end of a rocky east-west-aligned ridge.[1]
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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. It is defined by faults to east and west. There are a handful of disused gritstone quarries on the southern slope of the hill. To its north are large quarries working the Carboniferous Limestone outcrop which parallels the narrow band of Basal Grit running west to east through the region.[2]
Carreg Dwfn is designated as open country. A public footpath runs around the western, northern and eastern sides.