A strongly walled fort which crowns a hill at the east end of a long ridge descending from the Carneddau towards the Conway Valley: the defences are defined by three ramparts almost certainly incorporating the work of several periods. The entrance lies at the W end of the fort, at the point of easiest approach. Outside the outer rampart on the S and W are two areas set with pointed stones to form a chevaux-de-frise, local rocks 0.3m to 0.9m long but mainly the shorter lengths. Inside and between the ramparts are 20 huts in one of which excavation revealed evidence for iron working.
RCAHMW, 1950