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Koh Bon stands out for deep pinnacle diving due to its twin submerged limestone pinnacles off the small granite island, 20km northeast of the Similan Islands, where depths plunge from 18m summits to over 50m.[1][2][3] Yellow soft corals blanket dark rocks, forming vivid contrasts amid strong currents that demand skill, while manta ray cleaning stations draw pelagics year-round.[4][5] This remote site delivers raw Andaman Sea adventure, far from tourist crowds, with whale shark sightings possible in season.[3][6]
Prime dives circle Koh Bon Pinnacle (Hin Luang), descending steep north walls to sandy bottoms for leopard sharks, then swimming south at 28–30m to the ridge's coral gardens.[1][2] The adjacent second pinnacle adds a 50m traverse at 24m, revealing eagle rays and reef sharks.[5][7] Koh Bon Ridge offers shallower fringes for hard corals and mantas, best combined on liveaboards for multi-dive days.[3][4]
Dive October–May, peaking November–March for 20–40m visibility and manageable currents; parks close June–October for monsoons.[2][5] Expect 18–50m depths, moderate-to-strong currents requiring negative entries and no mooring buoys.[1][3] Prepare with advanced training, Nitrox, and SMBs; liveaboards provide briefings for safe blue-water descents.[6]
Local Khao Lak dive crews treat Koh Bon as a pinnacle jewel, sharing tales of manta encounters passed down from captains who navigate its unmarked reefs. Thai operators emphasize respect for marine life at cleaning stations, blending professional guiding with Andaman fishing heritage. Divers bond over post-dive Thai meals, fostering community around these elite sites.
Book liveaboard cruises from Khao Lak 3–6 months ahead for November–March slots, as day trips limit deep pinnacle access due to travel time. Confirm operator experience with Koh Bon Pinnacle, prioritizing those using negative entries for currents. Advanced certification (PADI Advanced Open Water or equivalent) proves essential, with dives restricted to perfect viz and moderate conditions.
Arrive in Khao Lak the night before departure for early check-in and gear fitting. Pack reef-safe sunscreen, motion sickness meds for boat rides, and logbook for site-specific briefings. Rent enriched air Nitrox if certified to extend bottom time on deep profiles.