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Koh Bon

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...Good for: Large animals, value-for-money, advanced divers
Not so good for: Wrecks, beginners, non-diving activities...

Koh Bon Island lies an hour or so north of the Similan Islands. It's one of the best places in Thailand to see manta rays, especially from April to May, though the last couple of years have seen Mantas almost year round.

Diving at Koh Bon with manta rays - Dive The World Thailand

There's a 33 metre wall on its south side, facing a small cove, with a stepped ridge pointing west and down to over 40 metres. It is at the edge of this ridge that divers are drawn, as they peer into the blue looking for that first sight of a black and white wing that signals an approaching manta ray. Keep a little distance from the rays and the chances are good that they'll circle and swoop around, feeding on the plankton. If the manta feels threatened by rapid or aggressive movements it will just glide off into the distance and find somewhere else to feed.

Manta rays are not the only reason that Thailand dive cruises visit Koh Bon though. Leopard sharks are common at the ridge on the sandy flats below the wall, and white tip sharks can be seen roaming the depths off the edge of the reef. Soft corals the colours of turquoise, yellow and green dominate. Listen carefully and you'll hear the warning clicks of hundreds of nervous damselfish, and the coral crunching of hungry titan triggerfish, but don't neglect the wall itself which has plenty of critters to keep you interested including various types of moray eels. Show more



Koh Bon Reef Basics:
Map of the northern Thai Andaman Sea (click to enlarge in a new window) Depth: 5 - >40m
Visibility: 15 - 40m
Currents: Can be strong
Surface Conditions: Can be rough
Water Temperature: 26 - 29°C
Experience Level: Intermediate - advanced
Number of dive sites: 3
Diving Season: November to April
Distance: ~145 km north of Phuket (8 hours), 50 km northwest of Khao Lak (3 hours, or 1¼ hours by speed boat)
Access: Thailand liveaboards and some day trips
Recommended length of stay: 1 day