This dive site, Koh Bon West Ridge, is situated on an uplifted limestone island approximately 50 km west of Khao Lak and 20 km north of the renowned Similan Islands. It features a prominent long and narrow ridge point on the island's west side, acting as a natural attractant for nutrient-rich currents. Divers typically navigate along this ridge, observing the marine life drawn to the currents for feeding.
The diverse marine ecosystem here is a major draw for divers. Expect to encounter majestic manta rays that frequent the area to feed, as well as an array of other large pelagic species including whale sharks, tiger sharks, and eagle rays. The site is also teeming with vibrant schools of fusiliers, which in turn attract migratory predatory fish such as bluefin trevally and bluefin tuna, creating a dynamic underwater spectacle.
The best time to visit this dive site, like much of the Similan region, is typically during the dry season from November to April when sea conditions are calmer and visibility is at its peak, offering the best chances for pelagic encounters. While the average depth of 12 meters makes it accessible, potential variable currents on the ridge mean divers should be experienced or dive with caution. Freedivers will also appreciate the opportunity to encounter large marine life.
