The Warren is a long sandy beach north of Abersoch backed by dunes and a holiday park, with small shingle lower down. At the northern end is the granite headland of Trwyn Llanbedrog, which has remnants of former quarrying. The beach looks out towards St Tudwal's islands to the south-west and the Cambrian mountains towards the east. Parking at the northern end is at a small free car park pleasantly situated amongst trees just below the headland and within a few yards of the beach. At the centre and southern end parking is available in lay-bys of the A499 (landward side of road) just outside of Abersoch. From here access to the beach is either a short, sandy path through the National Trust's Tywyn y Fach property, or a public footpath through the Warren holiday village (Grid Ref SH317298). Alternative access is along the beach from Abersoch. Dogs are allowed at all times.
This beach was once known as Castellmarch beach, and is sometimes called Quarry Beach.