Castle Bay, which lies on the SE coast of the island about 2 miles N of Cape Winifred, is deep and clear in its central part.
A rock, awash, lies about 0.3 mile S of Castle Bay Point, the N entrance point of the bay. Foul ground, with depths of less than 9.1m, extends about 0.2 mile S from the rock.
A dangerous wreck lies in shoal water about 0.3 mile SSW of Castle Bay Point.
During fair weather, anchorage can be taken, in depths of 25.6 to 27.4m, with Castle Bay Point bearing 062°, distant about 0.5 mile.