Situated 20m/28km northwest of Similan Island but still considered to be part of the Mu Ko Similan National Park, Koh Bon "West Ridge" is a stunning, sloping island ridge teeming with a vast array marine life. The wall on the southern tip of the ridge is covered by soft corals of yellow and purple and gradually falls away to depths exceeding 40m/131ft. The northwestern side of the site is characterised by a rich expanse of coral gardens and scattered coral outcroppings, each its own ecosystem supporting a variety of fish and critters. On top of the ridge itself overhangs and canyons are adorned with encrusting corals, finger corals and colourful alagaes creating perfect hiding holes for crabs, shrimps and octopus.
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