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
Check our prices

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.



  • positive review  Big Thanks to Blue Planet for a great day 3/3. And specially thanks to Brice who was a very professional and nice diveinstructor. He gave me a very good refresh for my OW cert because its been a while sins my last dive. After that we did two really good dives at Koh Bida.

    thumb Liselott Håkansson
    4 March 2020
  • positive review  Super søde instruktører og meget tålmodige. Man føler sig tryk og i gode hænder. Helt sikkert et sted jeg altid vil vende tilbage til.

    thumb Randi Bergfriedt
    1 February 2020
  • positive review  Des pro, organisés, toujours passionnés de plongée et surtout, toujours au top avec la clientèle, ne pas hésiter, leur catamaran de 16 17m saura vous ravir sur le lit bleu des îlots de koh lanta

    thumb Théophile Creach
    30 January 2020
  • positive review  Super équipe ! Très pro et bon esprit !

    thumb Paco Fernet
    26 April 2019
  • positive review  Brilliant friendly staff definitely recommend 👍

    thumb Ian Westerby
    14 February 2019
  • positive review  Together with my son and daughter we booked a day dive trip to Koh Haa, Hin Muang and Hin Daeng, with Blue Planet Divers. Although a bit expensive (specially after Koh Tao), we were very satisfied with the high quality of their service. The office staff were kind, friendly and helpful with information in both english and french. Highlights: catamaran trip to dive sites with tasty food and enough space to chill and admire the beautiful landscape * well maintained equipement * Koh Haa is a must! With caves, extraordinary biodiversity and a gorgeous setting. Thanks to Yann, Johan and Fins for their diving support. Highly recommended!

    thumb Eliane Bueno De Sá
    6 February 2019
  • star rating  I 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
  • star rating  Blue Planet was very responsive on WhatsApp to organise the dives, and the package quoted for 2 days diving was very reasonable. They pick up and drop off from your... read more

    avatar thumb pap5225
    1 January 2023
  • star rating  Fantastic day diving and snorkelling with Blue Planet Divers. Our sons (11 and 14) tried a Discover Diving day and my wife and I snorkelled. Etienne looked after the boys... read more

    avatar thumb 198antb
    25 December 2022
  • star rating  Etienne is our great experience Dive Instructor. My friend and I having funny diving time with him. And he always take care of us.

    avatar thumb Ming C
    9 December 2022
  • star rating  This shop is amazing, they are very professional, super friendly and organized, the boat is quite nice and the food on the boat is delicious.

    We did 4 dives... read more

    avatar thumb 902fernandoo
    29 November 2022
  • star rating  First time trying diving and I couldn’t have asked for a better experience! Instructor Lawrence is a top professional and knows everything, he made us feel calm and secure which... read more

    avatar thumb N7484GTlucasw
    19 November 2022
  • We've had a great 3 days diving experience at sites like Ko Bida Nok, Kled Kaeo Wreck, Koh Haa - some of the best places in Thailand. Dive instructor Katarina... read more

    thumb Mariya Velychko
    8 December 2019
  • 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

    thumb YOUR STORY GUY
    9 October 2019
  • Great outfit, good food and equipment, and excellent staff. Diving was awesome especially to see whale sharks up close on three of my dives.

    thumb Nico Wempe
    8 March 2020
  • Very warm and welcoming staff, equipment and safety in place, the food in the boat was much better than in other boats I’ve been in Thailand. I’ll definitely come back... read more

    thumb Pau Badia
    24 December 2020
  • Awesome experience. It was my first dive ever, definitely not the last. Great places, awesome people ...

    thumb Julien Quéré
    23 February 2020