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Thailand :: Khao Lak : Koh Bon

Considering that Koh Bon is only 40 kilometres north of Similan Island number 9 it is surprising how much different the rock and reef composition is here. It is one of the few true wall dives in the Kingdom, the vertical rock dropping down to around 34 metres with coral ridges going even deeper. Although the soft coral isnt as abundant as the in the Similans you will notice different shades of blue, turquoise and yellow here. Koh Bon is one of the best places to spot manta rays, usually in the months of April and May. An exposed pinnacle lies to the west of Koh Bon, this also attracts big current feeders.

Boats usually moor up in the secluded bay where an arch through the island can be used for navigation. Look out for octopus and small critters hiding in the crevaces of the wall on the dive. Mantas can be found feeding or visiting the cleaning station here at the right time of the year. Also be aware of strong currents and down surge as the waves hit the wall face.

Thailand liveaboard trips

We now also offer liveaboard trips to the Andaman from Thailand, visit the Similans, and world class dive sites of Richelieu Rock, Koh Bon and Koh Tachai from the luxury of a liveaboard, find out more here: Thailand Liveaboards


Depth: 10 - 40m

Viz: 15 - 40m

Currents: Can be strong

Getting there : Liveaboard or speedboat

Best months: Oct / May


This map is taken from Pocket divesite's guide book: Similans including Koh Bon, Koh Tachai, Richelieu Rock more. Info at


Thailand Liveaboards
Similan islands