Trap (sometimes Trapp) can be found on the banks of the River Cennen four miles north of Llandeilo in the county of Carmarthenshire, South West Wales. The village sits on the western edge of the Brecon Beacons National Park in the shadow of the Black Mountain. There are many walks in this beautiful area of South Wales. The village pub, the Cennen Arms, offers good food and real ale.

Trap is most famous for the nearby castle, Carreg Cennen.

The Welsh Lord Rhys of Deheubarth built the castle some time in the 12th century and his descendant Rhys Fychan later inherited it. However, he was betrayed by his mother Matilda de Breos when she passed the castle to the English.

In 1248 Rhys managed to seize the castle once again, but it was captured by his uncle Maredudd ap Rhys Gryg. In 1277 it was taken into the hands of King Edward I and from then onwards remained with the English. Much later in the 19th century, the castle was given to the Earls of Cawdor. The Cawdor family held the castle until 1932, when it was passed to the guardianship of the Office of Works.