The Lagoon

The Lagoon - Top Dive Site at Ko Haa

Dive the famous Lagoon at Ko Haa. With stunning visibility, a superb variety of marine life and pristine corals, the Lagoon is an underwater photographers paradise and is great for macro and juvenile marine species.


Ko Haa’s central lagoon area is a must-see for any diver or snorkeller visiting Ko Lanta. The crystal-clear waters make for an Underwater Photographer’s paradise and the wealth of marine life is sure to delight every visitor.

Cruising into the picture perfect lagoon of Ko Haa is a treat for novices & experienced divers alike with its little white sand beach, stunning karst islands & crystal clear waters.

The lagoon is home to beautiful reefscapes, a beautiful large table coral covered in nervous humbug fish & many colourful reef fish such as Porky, the resident & very curious Porcupine Pufferfish, Clownfish (aka Nemo), Lionfish, Scorpionfish, Snapper, Barracuda & even Turtles. Due to its shallow waters and calm conditions, this site is a photographers dream and is one of the best sites in the area for finding macro delights such as Ornate Ghost Pipefish & Harlequin Shrimps.

The marine life that can be found at Ko Haa varies from rare Ghost Pipefish measuring only a few centimetres, to an abundance of Octopus hiding amongst the rocks and crevices. A Hawksbill Turtle is often seen swimming amongst the pristine coral. The clear waters and consistent visibility of 25m+ make the Lagoon an un-forgettable diving destination.

The Lagoon offers a safe and relaxed starting point for you to take your first underwater breaths and there are some extremely friendly little Porcupine Puffer Fish, ready to make your acquaintance in the large, sandy bay area. The bay slopes gently onto the reef allowing you to progress into your first dive effortlessly.

The snorkelling in the Lagoon is among the best in the area, with breathtaking corals at only a few metres depth, you can appreciate much of the marine life effortlessly as you float in the turquoise waters.

Ko Haa Lagoon at a Glance


Lanta Dive Site Ko Haa Lagoon Highlights

We make trips out to the King Cruiser Wreck, Shark Point & Anemone Reef about once per week during high season, onboard our comfortable, faster, bigger boat; MV Maya II. These sites are recommended for more experienced divers due to their exposed position and likelihood of currents and reduced visibility. These dive sites provide a diverse choice of diving environments that can be experienced within a single day-trip from Ko Lanta.

We keep group sizes small to ensure you get the most out of each fun dive. This also reduces impact on our reefs. Our emphasis is on safety, fun and personal service within a relaxed and stress-free environment. You will find the atmosphere and service on our dive boats, beyond anything you have experienced before!

Our experienced Instructors and Divemasters know the dive sites extremely well, and are happy to discuss what you would like to see, and the type of dive or snorkel experience you would like to have. Each dive is personally planned with the divers in each group, to ensure you enjoy each and every dive you make with us.

A full briefing is provided at each site, with helpful tips on what to look for, safety information, and the most interesting places to visit.


Ko Haa Lagoon Dive Site Images

The King Cruiser Wreck is recommended for experienced Advanced divers who have dived recently, due to its exposed position, the likelihood of strong currents and reduced visibility. This is a great dive site to dive with Enriched Air (NITROX).


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Koh Haa Dive Site Tips – Insider Knowledge from the Locals!


Koh Haa’s central lagoon area is a must-see for anyone visiting Ko Lanta. The crystal-clear waters make for an underwater photographer’s paradise and the wealth of macro and juvenile marine life is sure to captivate even the most experienced divers. For beginners, the Lagoon offers a safe and relaxed starting point to take your first underwater breaths. Friendly Porcupine Pufferfish are ready to make your acquaintance and the gently sloping reef allows you to progress effortlessly into your first dives.

The caverns are one of Ko Haa’s highlights and consist of a series of large interconnected chambers and swim-throughs. The largest cavern has three chambers and is known as The Cathedral. The first two chambers are connected by a shallow swim through at about 9 meters, which offer stunning silhouette photo opportunities. At low-mid tide, it’s possible to surface inside the Cathedral and see the limestone stalactites looming from the high ceilings as the light cascades upwards from the wide entrance below.

Ko Haa Neung is home to the famous Chimney system, as well as the site for the annual Clownfish Release Project. The lower entrance can be found at 16m – a narrow crevice carved into the southern face that widens into a chamber large enough for 3-4 divers to gaze upwards, almost to the surface. A side-tunnel accesses a large, shallow chamber with huge windows facing north and south. You can find sea snakes, lionfish, nudibranches, glass shrimps and many other small crustaceans and cowries on this site.


Download our free Lanta Dive Site Guide – includes Dive Site Maps & Marine Life Guide

Scubafish - Guide to Ko Lanta's Top Dive Sites


Lanta Weather Conditions
When to come to Ko Lanta
Diving in the Low Season


Dive Site Map of Ko Haa Lagoon


Dive Site Map - Ko Haa Lagoon

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