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Dive Koh Haa One

Mu Ko Lanta National Park

We love diving Koh Haa due to the usually good visibility, wide range of underwater geology, extensive coral reefs and diverse marine life. The six islands at Koh Haa are also some of the best dive sites in southern Thailand.

Diving Koh Haa One

The most northerly of the Koh Haa Yai islands is Koh Haa One, with a dramatic west side characterised by steep walls and huge rocks, and a more shallow east side, a mix of wall and sloping reef.

Whale Shark @ Koh Haa with Dive & Relax

At the east side of Koh Haa One, a large rocky ridge runs from the edge of the island into the deeper water of the north east, creating a long coral encrusted finger visible from the surface, and teeming with life.

Koh Haa - The Chimney

At the south west edge of Koh Haa One lies a series of swim throughs and caverns known as 'The Chimney', which is one of the highlights of diving the Koh Haa islands.

With several shallow entrances, a large, central chamber around 8 - 9m, an exit around 17m, and another shallow exit into the 'fish bowl' some parts of The Chimney can get a little narrow in places making it suitable for more experienced divers.

The Chimney @ Koh Haa with Dive & Relax

At the bottom of The Chimney lies a dense garden of white and lilac soft corals around 20 - 22m where the occasional turtle is found, along with stingrays, snapper, trumpet fish and many others.

Giant chunks of rock, fallen from the island above, lie in the sand to the south east of The Chimney - check the deep cracks in these boulders for huge snapper, grouper, and other species sheltering from the divers.

For the macro underwater photographer, countless nudibranchs, tiny crabs, shrimp, seahorses and ghost pipefish are just some of the many species to be found around the wonderful island of Koh Haa One.

Koh Haa One is usually dived along with Koh Haa Yai or Koh Haa Lagoon.

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

Snorkeling at Koh Haa One

The south and east parts of Koh Haa One are best for snorkeling, especially over the shallow finger ridge to the east.

The south face of the island provides the best shelter from any possible winds from the north east, with plenty of coral and marine life to see in the shallow water right up to the sheer rock face of the island.

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

Dive Site Guide : Koh Haa One
Visibility: 15m - 30m +
Level of Diving: All Levels
Snorkeling: Yes
Depth: 3m - 35m +
Journey Time: 25 - 35 mins
Koh Haa One 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