Another dive site that is part of the National Park of the Similan Islands, Ko Bon, is the best site in Thailand for spotting manta rays, which can be spotted all year round. The dive site is a 33-meter wall on one side with a small cove and ridge. Divers normally rest on this ridge and peer over the side of it to spot the large and graceful manta rays. As the ridge is not that deep, the site can be dived by divers with advanced certification. Divers should also take care when the currents are strong.
Divers should be careful to keep their distance from the rays as they often circle as they feed and so can change direction quickly. If the manta rays become disturbed by divers, they will move on and feed elsewhere which can be disappointing for divers.
In addition to Manta Rays, divers can also spot black tip reef sharks, marble rays, eagle rays, leopard sharks, and Napoleon Wrasse. Blue fin trevally and tuna can be spotted hunting the many fusiliers here as well.
There are many smaller creatures for macro divers and many are drawn here for night dives to try to spot some of the many different species of crustaceans and invertebrates that only come out at night. The site also has many beautifully coloured corals including yellow and blue soft corals, sea fans, and sponges.