Bryn Rhosau cairn is a centrally disturbed, subcircular ditched cairn, 13.5-12.5m in diameter & 1.3m high, slab-revetted on the north. It lies immediately north-east of Cairn II (NPRN 400910) upon a summit area.

Source: Briggs in the Cardiganshire County History I (1994), 184 No.73

John Wiles 22.07.04