From northeast the bank extends about 55 km southwest, with a least reported depth of 7.3 m located about 15 km southwest of Mount Scenery. A depth of 8.2 m lies about 16 km south of the island. The eastern side of the bank is fringed with a ridge of living coral, sand and rock, nearly 48 km in length. The depths over the ridge range from 11 to 35 m. Westward of this ridge, except for a few 16.5 m and 18.3 m coral patches near the south side of the bank, and a 16.4 m patch near the west end of the bank, the bottom is clear white coral sand with depths of from 21.9 to 36.6 m, gradually increasing towards the edge of the bank, but ending abruptly in depths of 54.9 m. In depths of under 20 m, the bottom can be distinctly seen.