Three peaks of a massive underwater mountain range known as the Cayman Ridge form Grand Cayman, Cayman Brac, and Little Cayman. The islands have no rivers to dump sediment into the water, making for excellent visibility, and the steepness of the underwater slopes harbor a variety of underwater life and allow large marine species to swim in close. This topography also means that many of Cayman's 365 dive sites are near shore.
Dive day and night on the shallow but extensive reef just off the rocky shore of Sunset House, a 15-minute walk south of George Town. Nearer town, Eden Rock and Devil's Grotto reefs lie a short distance from shore and range from within a few feet of the surface to 40 feet, surrounded by a sandy bottom. Buoys marking the sites are clearly visible from land. Devil's Grotto features many swim-throughs and frequent bait balls and big eye tarpon. Huge coral heads and pinnacles are swarmed by sergeant majors and yellowtails at Eden Rock. Cobalt Ridge, just off Cobalt Coast Resort on the northwest shore, makes a nice off-the-beaten track shore dive.
On Cayman Brac, shore dive the Captain Keith Tibbetts Wreck, one of the few Soviet Union wrecks in the western hemisphere. While many dive the 300-foot frigate by boat, it is only a 200-yard swim from shore starting at the Buccaneers landmark.