The Warren is a sandy beach about 1½ miles long, extending from Abersoch harbour to the granite headland of Mynydd Tir-y-Cwmwd at the north-eastern end. Parking at this end is at a small free car park pleasantly situated amongst trees just below the headland. At the centre and southern end, parking is available in lay-bys alongside the A499 (landward side of road). Access to the shore from here 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). The beach looks out towards St Tudwal's islands to the south-west and the Cambrian mountains towards the east. Alternative access is along the shore from Abersoch.
This beach is sometimes known as Castellmarch beach, the eastern end as Quarry Beach or Glan Mor Gwaith. Its far western (Abersoch) end is known as 'Traeth Tywyn y Fach' or simply as 'The Fach'.
Dogs are allowed at all times.