Castell Carreg Cennen is a castle near the River Cennen (Carreg being Welsh for stone), in the village of Trapp, four miles south of Llandeilo in Carmarthenshire, Wales. The castle is within the Brecon Beacons National Park, and its location has been described as spectacular, due to its position above a limestone precipice. It has been in a ruinous state since 1462 and is now in the care of Cadw, the Welsh Assembly historic environment service, and is open daily from 9.30am to 6.30pm between April and October.