Carn Fadryn is a modest, cone-shaped hill on the Llŷn Peninsular, just 370 metres high but commanding extensive views. It was the site of a substantial Iron Age hillfort and also a medieval castle, the remains of which can still be seen. Our walk starts from the village of Garnfadryn, crossing grassy fields and exploring the area around the base of the hill. Eventually, we turn and climb on a narrow path winding through the heather to reach the rocky summit. We descend on the same path, completing the circuit of the hill to return to the start.