Centurion Bank is a wholly submerged atoll structure in the Southwest of the Chagos Archipelago. It is about almost 10km (10miles) long northwest–southeast, and more than 3km (02miles). The reef area is about 25km2.[1] The closest land is the Egmont Atoll located 122km (76miles) to the NNE. The Centurion Bank is the southernmost feature of the Chagos group.