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Dive Koh Rok - Lak Siam

Mu Ko Lanta National Park

Diving Koh Rok - Lak Siam

The long and extensive sloping reef covering almost the entire east coast of Koh Rok Noi is one of the best dive sites at the Koh Rok islands.

The sandy beach is fringed with a huge area of corals which makes this a super snorkeling spot, and as we head a little deeper we encounter a sloping reef which runs to 15 - 20 m the entire length of the island. The snorkeling here is as good as Koh Haa Lagoon.

Dropping in the middle of Lak Siam, we can either dive with our right, or left shoulder to the reef.

The slope is covered extensively with a huge variety of hard and soft corals, creating a dense and rich coral reef including branching corals, bubble corals, mushroom corals, lettuce corals, anemones, brain corals, leather corals, soft corals and sea fans. We think this is one of the best dives at Koh Rok.

Diving @ Koh Rok with Dive & Relax

The dense corals are home to millions of reef fish, including moorish idols, snapper, fusiliers, grouper, wrasse, moray eels, angelfish and butterfly fish, clownfish, shrimp, sea cucumbers, snails, slugs, urchins, feather stars, surgeonfish, parrotfish and many, many other species.

We can also find several species not commonly seen around our other dive sites, such as the convict surgeonfish and more rare species of butterflyfish and angelfish.

Here you will definitely find nemo.

Diving @ Koh Rok with Dive & Relax

Along the deeper fringes of Lak Siam we find an almost continuous line of giant gorgonian sea fans, giant barrel sponges, and bubble corals, the favourite food of the many turtles which we often see along this reef.

Indeed, it is unusual not to see at least one or two turtles on this dive, sometimes many more.

The southerly part of Lak Siam becomes a more rocky slope and it approaches the shallower end point of the Hin Ngam dive and begins to take on similar features to the end of the Hin Ngam dive.

Find out more from the Thailand Department of National Parks on the Mu Koh Lanta Marine National Park.

Book online to save 10% on dive trips and scuba courses on Koh Lanta.

Dive Site Guide : Koh Rok - Lak Siam
Visibility: 10m - 30m +
Level of Diving: All Levels
Snorkeling: Yes
Depth: 0m - 20m +
Journey Time: 50 - 60 mins
Koh Rok Lak Siam Dive Site Map

Koh Lanta Dive Sites

Find out more at the Thai Department of National Parks.


Certified Diver Prices Online Price Walk-In Price
Koh Haa / Koh Rok(all levels of diving) ฿3,150 ฿3,500
Koh Bida / Koh Phi Phi(all levels of diving) ฿3,150 ฿3,500
Hin Daeng & Hin Muang(experienced divers only) ฿3,950 ฿4,300
Shark Point & Anemone Reef(experienced divers only) ฿3,950 ฿4,300
  • Minimum Open Water Diver, or equivalent.
  • All trips are 2-tank dives. Includes free equipment rental, lunch & soft drinks on the boat.
  • Scuba Skills Refresher for extra ฿900 when Booked Online (Normal Price ฿1,000)
  • Does not include Marine Park Diving Fee: Adult ฿600, Child: ฿400 per day.

Our Boat Trip Schedule

Our dive trips depart Koh Lanta in the morning every day from the south end of Long Beach, returning to Koh Lanta around 1:30 - 2pm, depending on how the day goes.

Week Day Boat 1 Boat 2
Monday Koh Rok Islands Koh Rok Islands
Tuesday Koh Haa Islands Hin Daeng & Hin Muang
Wednesday Koh Bida / Phi Phi Koh Bida / Phi Phi
Thursday Koh Haa Islands Koh Haa Islands
Friday Koh Haa Islands Hin Daeng & Hin Muang
Saturday Koh Bida / Phi Phi Koh Bida / Phi Phi
Sunday Koh Haa Islands Koh Haa Islands
  • All trips are 2 dives a day
  • Trips depart from the beach at our dive shop @ Lanta Castaway Beach Resort
  • Trips Depart 8/9am, return 2pm
  • Dive & Relax is open from Oct 15 - May 15.
  • E-mail us info@diveandrelax.com in advance with any questions, or to make a booking.

We may schedule a Shark Point & Anemone Reef dive trip or a KledKaeo Wreck dive trip upon request. A minimum of 5 divers are required for these trips, please let us know if you are interested.

We love to dive as much as possible during the high season, however all our dive trips depend on the weather, sea conditions, currents and minimum numbers and may be subject to change at short notice.

Book online to save 10% on dive trips and scuba courses on Koh Lanta.

For more information on our weather and climate, check out the best time to visit Koh Lanta.

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Diving, Snorkeling & PADI Courses

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  • Please let us know:

    • when will you arrive on Koh Lanta?
    • your previous dive experience?
    • which diving activities you are interesed in?
  • If you're already here on Lanta, you can call or WhatsApp +66 (0)89 050 3009