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This is the smaller of the two Bida islands and the one closest to Koh Phi Phi Lei. It is possible to circumnavigate the island in about an hour. There are some nice big crevices and a couple of swim-throughs to explore. The west side of the island has a vertical wall, whilst the east side is a gentle sloping reef with large sand patches.
There is a profusion of marine life at Koh Bida Nai. Not only is the reef home to a huge array of fish species, but the soft and hard corals are stunning, especially on the western wall. Zebra sharks are seen resting on the sand, whilst black-tip reef sharks circle the island. Hawksbill and green turtles are common, as are banded sea kraits and octopuses. Macro-life is also excellent with many varieties of shrimp, nudibranch and crab easily spotted.
Average depth – 15m
Maximum depth – 26m
Average visibility – 20m