sea level. Approximately one-third of Barbareta is covered by serpentinite, making it the island with the largest deposit of serpentine among the Bay Islands. Morat, the smallest and flattest island, consists of just one ridge with two hills, which are composed mainly of sedimentary rocks, with some serpentinite intrusions.

The Bay Islands have no rivers and a small number of streams, which usually end at mangrove swamps (of which there are plenty on the Islands). There are, however, a large number