Koh Haa

“The macro paradise”

Well known for its environmental water quality.

Max depth 40m - Visibility 30m
Open Oct. 15th to May 15th
Family Recommended
All activities
For everyone
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Koh Haa, amazing site for all!

This beautiful archipelago is located two hours away from every inhabited island. Actually, Koh Haa site consists of five separate islands (although a pinnacle joined to Koh Haa 5 has earned the rather confusing nickname of “Koh Haa 6” and represents a dive site of its own).

There at Koh Haa site,  you will find reefs, lagoons, swim troughs, huge caverns, and a wide variety of marine life, including the occasional pelagics, such as manta rays and whale sharks.

Several stunning sites

Most popular for “the chimney”, this vertical swim-through begins at a depth of around 4 meters on the western corner of the island and descends to a small cavern at approximately 9-10 meters, from where divers continue diagonally down to exit at approximately 17-18 meters.

Fascinating site

This is a favorite spot to visit both for divers and freedivers. If this seems scary a bit, then as an alternative, spherical cavern nicknamed “the fish bowl” after the school of bronze sweepers that are found residing there can be accessed behind the chimney at approximately 8 meters. The site itself consists of walls, plateaus and sloping reefs and is an excellent place to spot nudibranchs, shrimps, pipefish and the occasional frogfish along with much more wonderful marine life.

These islands come together to form a magnificent lagoon which has a lot to offer both for beginners and more experienced divers. Nice sandy areas provide an excellent place for students to practice skills easily and without fear of damaging marine life. Experienced divers will be certainly amazed by the plethora of that very same life, including frogfish, mantis shrimps, octopuses, harlequin shrimps, pipefish, sea moths and turtles, and occasionally even whale sharks!

Incredible layers

The outer side of the Island 4 is a steep wall dropping from the surface down to around 22 meters, from where a sloping reef then continues down to around 35 meters. There is a sloping sandbank between Island 4 and Island 2 that makes an opportunity for a short “muck” dive on the spot where many interesting marine creatures have made their homes in the sand. The wall rises again from the depths at around approximately 20 meters to make up Island 2, but unlike her sister, the majority of this dive site is made up of sloping reefs.

Amazing lagoon

For those who have not yet made the plunge beneath the water with diving, snorkeling in the shallow lagoon within the borders of these three islands is a must-to. There are substantial areas of hard corals just meters below the surface and a small beach on Koh Haa 3 can also be accessed for those who may wish to rest during their snorkeling activity.

Koh Haa Yai is the largest island in the archipelago and is most famous for the Cathedral, a series of three large caverns located to the south of the island. Two of these caverns begin at approximately 14 meters deep and rise up to the surface, while the last one continues to rise for approximately 10 meters more. In favorable conditions, divers can surface in this largest cavern that offers an amazing unique diving experience. It goes without saying that this is reserved for technically skilled cave divers only.

Great for all

The site itself consists of small walls and sloping reefs descending down to approximately 25 meters. On the other hand, sandy beach area is an excellent place for students undertaking diving courses and a great place for snorkelers seeking for shallow areas to enjoy in wonderful marine life of the island. This spot is also notable for finding various forms of macro life, including nudibranchs, frogfish, and shrimps. Turtles and octopuses can also be regularly seen by keen diver’s eye.

The rather confusingly named Island 6 is actually a small pinnacle at the north end of Koh Haa Yai. It is connected to the island by a short sandy ridge approximately 13 meters deep. Not visited so often like the other islands of the archipelago (maybe due to lack of sand areas for students to use), this beautiful site should not be in no way dismissed! Offering unlimited wealth of soft and hard corals it attracts a wide variety of marine life, both small, within the pinnacle confines, and large in the surrounding blue. Occasionally, it even gets visited by leopard and whale sharks.



  • star ratingThe DC provides the best experience ever. I've been diving with Emir for fun dives in Hin Daeng and Hin Muang. The visibility is so clear, it can go up... read more

    avatar thumb AndreaEnos
    17 September 2023
  • star ratingDive with Blue Planet Divers Koh Lanta - Friendly budget price for diving 3 days.
    Dive Lead : Kabi is the best, he good at searching the big things and small things. I’m so happy.
    Boat is big... read more

    7 March 2023
  • star ratingConvenince for divers. Friendly vibe. - Friendly welcome. This dive center is international vibe. Good management on boat and also since preparation on shore (equipment). Staffs have good experience and skill. Espicially Kabi dive leader is... read more

    7 March 2023
  • star ratingGreat experience - Dive Shop
    Had a lovely experience with Blue Planet divers shop Koh Lanta - Thailand.Dive Shop deserve that 5 stars and the recommendations..
    because they do their job perfectly and... read more

    3 March 2023
  • star ratingHope to dive with you again, great experience - I was unable to dive due to injury but I would go to the shop everyday and was greeted, they have a nice sitting area next to the water... read more

    25 February 2023
  • star ratingI just did my open water diving licence there and the guys from the Diving Center are doing a very professional job (they are not overwhelmingly friendly or funny, I... read more

    avatar thumb Stay08598734055
    9 February 2023
  • Awesome experience. It was my first dive ever, definitely not the last. Great places, awesome people ...

    Julien Quéré Avatar Julien Quéré
    23 February 2020
  • Almost everything has been said by the previous reviewers. Good atmosphere, nice instructors, well organized, the dive boat is well maintained and the food is good (breakfast and lunch are... read more

    Kevin EECKMAN Avatar Kevin EECKMAN
    29 July 2023
  • If you dive here, definitely ask for Eak to be your instructor! He was so friendly and fun to spend the day with. He made our experience really great 🙂... read more

    Holly Cooper Avatar Holly Cooper
    18 May 2023
  • Good company to dive with, easy communication before the dive day. Enjoyed two days diving with these guys. The catamaran is a great dive boat . Koh Lanta is a... read more

    Tdog Ambrose Avatar Tdog Ambrose
    3 December 2022
  • We did two full days on the boat, honest price, which includes breakfast, snacks and lunch, equipment rental and 2/3 dives. Very nice and comfortable boats. Prepared and attentive guides, special... read more

    Stefano Molinari Avatar Stefano Molinari
    13 December 2022
  • Blue Planet Divers is the place to go for diving in Thailand, they're based in Koh Lanta and dive close to Koh Phi Phi and other dive sites. I did... read more

    9 October 2019