The Vale of Ewyas is the steep-sided and secluded valley of the River Honddu, in the Black Mountains of Wales and within the Brecon Beacons National Park. As well as its outstanding beauty, it is known for the ruins of Llanthony Priory, and for several noteworthy churches such as those at Capel-y-ffin and Cwmyoy. It is sometimes referred to as the "Llanthony Valley" as Llanthony is the village situated at the valley centre.