What is "cilrhedyn"

Cilrhedyn is a hamlet and parish in the counties of Carmarthenshire and Pembrokeshire, Wales, in the hill country to the south of the Teifi valley. The Afon Cych divides it into two unequal parts: West Cilrhedyn, Pembrokeshire and East Cilrhedyn, Carmarthenshire. The parish church is in West Cilrhedyn.