DEPTH: 20-60 feet (8-18 M)
Thumb Rock is named for the large rock that stands out from Red Bluff Point, jutting from the water like a giant thumb, and the corresponding "thumb" that rises from the sea floor to just below the surface. There are ledges that undercut the shoreline as it drops away from the surface, and coral-encrusted boulders and patch reefs separated by sand areas. Large whitespotted filefish and parrotfishes cruise this area. Scrawled filefish can be found nibbling on the delicate tips of fire coral. Shy queen angelfish and more brazen French angelfish swim about in pairs, sometimes in trios.
Text extracted from The Guide to Diving and Snorkeling in the British Virgin Islands by Jeff Williams, Ria O'Hagan.