Ko Rok is a pair of uninhabited limestone twin islands — Ko Rok Nai and Ko Rok Nok — inside Mu Ko Lanta National Park off Krabi, about 26 km south of Ko Lanta Yai. The narrow, roughly 250 m channel between them cradles a shallow emerald lagoon where dense gardens of staghorn, table and brain coral sit just a few metres beneath the surface, with visibility reaching 30 m on clear days. That easy, calm water and vivid reef — clownfish tucked among the anemones, schools of butterflyfish, the occasional ray or hawksbill turtle — make it one of Thailand's best beginner-friendly snorkel spots. As of 2026 it remains a protected national-park zone and closes each year during the monsoon.
Shallow, sheltered lagoon in the channel between Ko Rok Nai and Ko Rok Nok — ideal for first-time snorkelers
Dense coral garden of staghorn, table, brain and mushroom corals just about 5 m below the surface
Anemones with resident clownfish, schools of butterflyfish, and occasional rays or hawksbill turtles
Beach entry and lunch on the white-sand national-park beach at Ko Rok Nai
Up to about 30 m visibility on calm, clear days
Good to know
SafetyThe channel is usually calm, but currents can pick up with tide and wind. Use a buoy or float, never snorkel alone, and don't let yourself drift toward open water. Speedboats move through the tour areas, so stay near the anchored zone.
SafetySea urchins cover parts of the shallow reef and rocks. Don't stand on the bottom or grab the coral, and wear reef shoes at entry. Beginners panic easily when a mask fogs or floods, so practise fitting and clearing it in shallow water first.
SafetyEven in 28–30°C water, a long session chills you, and the strong tropical sun burns and dehydrates fast. Wear a rash guard for cover and take regular breaks out of the water.
RulesThis is a protected marine national park: touching, standing on or collecting coral and shells is prohibited. Sunscreens containing oxybenzone and similar chemicals are banned, with fines up to 100,000 baht — bring only reef-safe products.
MannersKeep your distance from turtles and rays, never chase or feed them, and don't stand on the coral.
SeasonThe dry season, roughly November to May, is best. The park closes in the monsoon (about mid-May to mid-October), so confirm the reopening date and boat operations before you go.
Practical info
Ko Rok has no road access; it's reached by speedboat from southern Ko Lanta (Ko Lanta Yai) in about 45 minutes to an hour, usually as a day tour paired with Ko Haa. Foreigner park entry and camping fees, tour prices and departure schedules, and the seasonal opening date all change, so check the latest details before booking.
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