This fishtrap is visible on an historic Admiralty chart (1883-4) and probably comprised low stone walls set with wooden posts supporting wattle fences. It consists of three conjoined arms forming a zig-zag shape. The western-most arm points southeast and measures approximately 100m. The second arm points north and measures approximately 160m. The eastern-most arm points east and measures approximately 220m.

Sources include:
Historic Chart OCB1161-C1, 1883-4, Swansea Bay

Maritime Officer, RCAHMW, January 2011.comprises three arms.