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Koh Bon

The island of Koh Bon lies 13 nautical miles to the north east of Similan #9. Koh Bon is included in the Similan national park Thailand but differs from the Similans as Koh Bon is a sedimentary limestone island where the Similans are granite. The bay to the south of the island is is the mooring point for the diving liveaboards allowing you to take in the impressive scenery including the western ridge which includes an above the water archway passing from one side of the headland to the other. This western ridge is also the islands main dive spot.

The ridge extends in a south west direction from the island dropping steadily deeper. At about 20m this decline is halted and the top of the ridge falls only a further 5m to be 25m deep at the tip of the ridge. The sand bottom surrounding the ridge continues its decline getting down to depths greater than 40m at the tip. The limestone ridge is covered in small soft corals with black coral bushes, coral fans and seawhips also present. Look above the ridge for schoolsof fusiliers being hunted by blue-fin trevally and great baracuda. Definitely keep an eye in the deep for regular encounters with leopard sharks, marble rays and the occasional eagle ray passing by. This is also one of the best spots to find the magestic manta rays being cleaned and appearing to play in the current.

Other dive sites here include the bay to the east of the ridge which has a hard coral covered bottom and to the north of the ridge continuing all the way to the north west of the island is a fringing hard coral reef with a plateau around 10m deep and the edgo of the reef bottoming out at 20-25m. All of the above sites can be taken in on one dive with a north to south current takingyou from the north reef, over the ridge and finishing up in the bay or vice versa.

Another dive spot here lies around 200m from the north reef and is a submerged pinnacle covered in yellow soft corals. The top of the pinnacle only reaches 18m which in depth alone makes it a more advanced site. The base of the pinnacle is at 40m and deeper with the western side dropping down as a wall to this depth and the eastern side tapering off to this depth with more hard coral coverage. With it being such a deep site expect NDL's or air supply to limit your dive time. But shorter dives here are more than worthwhile as it is arguably the best dive site for encountering manta's and even the occasional whale shark. Other regular sightings include rainbow runners and spanish mackerel hunting the huge schools of fusiliers blanketing the site. Schools of batfish and pickhandle baracuda are also frequently encountered.

All in all a very interesting divesite for liveaboard diving in Thailand.

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