The small island of Mousa lies just off the south east coast of the mainland and is reached by small boat from Leebitton. It is in a very good state of preservation and still over 13m high. The overall diameter is 15m and the interior diameter about 6m. Galleries and stairs allow the top to be reached. An added attarction is the presence of many breeding Storm Petrels in summer. The pool on the east side is also very good for Common Seals.