Porth-y-Post and Porth y Corwgl are two of a series of small sheltered coves on the west coast of Holy Island. They are mostly of sand and shingle, and backed by a sea wall. A road (Lon Isallt) runs behind the beaches. Porth-y-Post (above) is approximately 100 yards wide and Porth y Corwgl is about 50 yards wide. Both are flanked by rocks and low cliffs of mica-schist which show unusual swirly patterns. The sea water is often crystal clear in summer, making them ideal for swimming, snorkelling, scuba diving etc.
Roadside parking is available just behind Porth-y-Post and access to the shore is down a few steps. Porth y Corwgl (one of three Anglesey beaches with this name) can be reached by following a public footpath about 200 yards further along Lon Isallt. The name Porth y Corwgl translates as 'Coracle Cove'.
Dogs are allowed at all times on these beaches.