Located 25km north of Koh Bon is Koh Tachai (Tachai island). It's about half way between the Similan Islands and Surin Islands and is often dived on the way to or from Richelieu rock. It is part of Muu Koh Similan National Marine Park. 
Koh Tachai is regarded as one of Thailand's best dive sites and is a favourite with dive staff. Very strong currents can make dives in this area challenging. Visibility is usually good, between 20m-30m but can drop to less than 10m.
There are several different places to dive around Koh Tachai and the most popular is Koh Tachai plateau about 1km off the south eastern side of the island. There is a mooring buoy marking the site and it is usually necessary to use the line to prevent being swept away from the dive site by the current. The plateau is a scattering of rocks piled around each other that start at around 13m and drop down to past 35m. The rocks are covered with corals, sea fans, crinoids and anemones. Divers use the rocks as protection from the current as they weave their way around the site. Continued >>
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