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The Similan Islands and Koh Bon stand out for leopard-shark-spotting due to reliable populations of Indo-Pacific leopard sharks resting on sandy bottoms from October to May. Koh Bon's pinnacles and ridges host common sightings alongside mantas, while Similan Island 3 sees groups of up to three sharks. This archipelago ranks in the global top 3% for leopard shark conservation, with increased reports since 2018.
Prime spots include Koh Bon Pinnacle for deep-water rests, West Ridge for corals and rays, and Similan Island 3 for group sightings. Divers encounter these bottom-dwelling sharks near coral heads and pinnacles, often inactive by day. Combine with Koh Tachai for additional leopard shark views amid granite boulders.
Dive during the October–May season for calm seas and 15–30m visibility; expect 28–30°C water temperatures. Prepare for advanced sites with strong currents at Koh Bon; book permits and boats early. Motion sickness aids help on crossings from Khao Lak.
Local dive operators in Khao Lak emphasize non-disturbance of resting sharks, aligning with national park conservation. Guides share insider spots from years of sightings, fostering respect for these nocturnal creatures. Communities promote eco-diving to sustain populations amid rising visitor numbers.
Book liveaboard trips or day boats from Khao Lak well in advance, as the Similan Islands National Park closes from mid-May to mid-October for monsoon season. Target October to May for peak leopard shark sightings, when seas stay flat and visibility exceeds 20m. Advanced certification helps access deeper sites like Koh Bon Pinnacle; confirm dive schedules include Koh Bon and Koh Tachai.
Arrive in Khao Lak the night before departures to avoid rushed transfers from Phuket. Pack reef-safe sunscreen, as park rules ban harmful chemicals, and motion sickness remedies for the 1-hour boat ride. Brief your dive guide on leopard shark interest to prioritize resting spots without disturbance.