Calf Rock is part of the Calf and Cow reef system on the south side of St. Thomas. The site is known for overhangs, ledges, canyons, and a very lively reef with shallower canyon sections that make it feel roomy rather than technical. A mix of lobsters, eagle rays, horse-eye jacks, nudibranchs, sharks, green morays, and turtles keeps the dive busy from start to finish.