The majority of St. Thomas dive sites are a little way offshore. St. Thomas has only a couple of sites fringing the island.
Instead, the sites tend to be around rocks and small islands (often called cays). Some sites are directly on submerged reefs with no evidence of their existence visible from the surface.
The interesting topography of many sites pleasantly surprised us.

Wreck Diving: St. Thomas has the monopoly on wreck diving, though the stores on the west side of St. John visit the General Rogers regularly and one or two of the others occasionally. All the wrecks are quite modern, though some already have impressively thick marine life growth.

West and South St. Thomas:Being at the extreme end of St. Thomas, it is not surprising that the west is the least dived area. Only dive stores in Charlotte Amalie or those on the south coast with large boats can reach the sites through the Savana Passage and out to Sail Rock. Many of the diveable wrecks lie in this area (see below). Both St. Thomas and some of St. John operators can reach the south of St. Thomas and it contains some of the islands’ most popular and heavily used sites.

Pillsbury Sound and North East St. Thomas: Another popular area, Pillsbury Sound is generally well protected from the weather and has a range of mainly shallow sites with healthy coral and some interesting terrain. The sites are used equally by St. Thomas and St. John operators.

See the book for 40 pages describing St. Thomas’ 43 dive sites and 9 dive stores, plus lots of information about the island, après dive activities, diving rules and regulations and marine life.