The remains of an earthwork cut across the neck of the Mull of Galloway immediately S of the enclosed fields of the Mull farm, at the narrow isthmus between the bays of East and West Tarbet. At one point some possible facing stones are exposed, but the bank is no more than 2.3m thick and 0.5m high. A substantial earthwork cuts off an area of about 57Ha at the East end of the Mull of Galloway; it measures 400m in length and is situated 330m SSE of the previous earthwork at the Tarbet. In most places it comprises three ditches with medial banks, the inner bank being the larger, measuring between 3.1m and 4m in thickness with an external height of up to 2.2m. It is believed the ramparts make this the largest Iron Age stronghold in Britain.