Hin Bida is a reef located between Koh Bida Islands and Koh Maa. This reef is well-known for providing the best chance of seeing leopard sharks, like up to five or six at a time, which practically makes this reef their home. Generally, these stunning creatures can be found resting on small sand patches in the shallows of the reef, but even if they are not there you should not be desperate, as venturing around the fringes of the reef normally yields a successful sighting. Hin Bida is a round reef with several fingers leading off to the south-west and with a maximum depth of around 24 meters at some places. The uppermost peaks break the surface as the tide heads to its lowest point. The reef is rich in hard and soft corals and for most kinds of marine creatures in the Andaman Sea this reef is a home. Zebra morays are seen commonly (if you are lucky enough to spot them).
Sometimes large banded sea kraits, larger than those we see on our other sites, can be seen there as well. Mangrove rays have been seen hiding under huge rocks, and the glimpse of a black tip reef shark or eagle ray swimming fast over the reef has been known to occur from time to time. On occasion, two or three cuttlefish can be seen mating, and the diver with a keen eye may just spot an octopus blending in with its surroundings. If you look more closely, there are many opportunities to spot lionfish and scorpion fish, sometimes four or five at a time, while many shrimps, nudibranchs and anemones crabs are waiting in hidden corners as well. This reef is definitely a favourite spot amongst photographers!