The islands are surrounded by placid lagoons ringed by coral barrier reefs that keep the larger waves of the open ocean away. Beginners learn in the shallow, clear, swimming pool-like waters of the lagoon advanced divers explore the coral slopes and canyons of the outer barrier reefs. Manta Point, Bangaram, as the name suggests, is the place where migrating manta rays visit between December and March to be cleaned by other fish. From 3m down to 24m the gently sloping reefs of mushroom coral and lobed-pore coral are filled with brightly hued fish, colourful swaying anemones and the occasional reclusive moray eels. Entrance Point, Bangaram, is located at the mouth of the Bangaram lagoon. Changes in the tides create currents that make this dive more interesting. Reef sharks and nurse sharks rest on the bottom at 26m, while eagle rays often ride past on the currents closer to the surface. Shark Alley, Kadmat, involves an ecstatic free-fall through the blue down to the bottom at 40m. The local 'watering hole' for grey reef, nurse, black-tip and white-tip reef sharks, the Alley is occasionally visited by tiger sharks and the elusive guitar sharks. The distant reefs of Peremul Par is an occasional dive trip organised for 'regulars' at the Bangaram resort - the untouched walls and coral encrusted slopes are host to excellent dives. Huge tuna, barracuda and enormous queues of pre-historic looking hump head parrotfish are regular fare here, with inquisitive dolphins riding the bow-waves on the boat ride back.