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Dive Koh Haa Lagoon

Mu Ko Lanta National Park

Diving Koh Haa Lagoon

The famous Koh Haa Lagoon comprises three islands, sometimes known as islands Two, Three and Four, however each has a traditional sea gypsy name. For example, Koh Haa Two has been called Koh Jepun, or 'Japanese Island' by local fishermen for as long as they can remember.

Diving @ Koh Haa Lagoon with Dive & Relax

These three central Koh Haa islands are connected in the middle by a shallow, sandy lagoon littered with thousands of corals, dozens of anemone beds, and home to hundreds of different marine life species.

There is a huge abundance of marine life around all three of the islands which make up the Koh Haa Lagoon, and how you dive these areas will depend very much on the experience of your group, air consumption, currents, etc.

Diving Koh Haa Two & Four

Mooring up in the Koh Haa Lagoon allows us the chance to dive both in and around the Lagoon, and also around both Koh Haa Two (Japanese Island) and Koh Haa Four.

Diving Koh Haa Two & Four begins in the lagoon shallows around 5 - 8m, gradually dropping off into deeper water on the outer (south) edges of the islands. The outside of Koh Haa Four extends to 45m + where the bottom becomes more muddy and less firm.

Diving @ Koh Haa Lagoon with Dive & Relax

The shallows of Japanese Island. especially inside The Lagoon, and facing west toward Koh Haa Four have created a wonderful hard and soft coral garden, and a great number of species can be found between 3 m and 10 m.

The diversity of species between the islands here is fantastic, with the sandy/rubble area between Koh Haa Four and Japanese Island providing countless subjects for the macro photographer.

The Resident Garden Eels

In addition to the macro life between Koh Haa Four and Japanese Island, there is a huge cement boat mooring block deeper, at 30m. Immediately beyond this mooring block is a huge field of garden eels.

If approached carefully, the eels will remain out of their burrows, waving in the water column to catch food and oxygen.

Diving @ Koh Haa with Dive & Relax

As you would do with any deeper dive, please be aware of air consumption and no-stop dive times in the deeper areas of Koh Haa.

There are also two very old resident garden eels living on the shallower south side of Koh Haa Four. Say hello on your way past, but please try not to disturb them...

Back of Island Three into The Lagoon

Several excellent dives begin at the back of The Lagoon, on the west side of Koh Haa Three.

This side of Koh Haa Three has a long combination of sloping reef and wall continuing down to the sandy bottom around 15 - 20m which makes for an excellent dive. Over the sand and rubble areas there are coral bommies extending to 25 - 30m.

Divers can also head around island three into the lagoon, either choosing to go south & west (left shoulder to the reef), or north & east (right shoulder to the reef). Both routes are quite different from each other and provide two completely different dives.

Diving @ Koh Haa with Dive & Relax

The south & west route is more shallow, with coral gardens, rocky ridges and a coral strewn sandy bottom leading into the lagoon. This dive has great macro life, including lots of lesser seen species over the sand and coral rubble close to the reef edge.

The north & east route is much more dramatic, with huge rocks and coral bommies leading to deeper water and home to millions of snapper, fusiliers, parrotfish, giant trevallies, great barracuda, emperors, and countless other species.

A finger reef stretches from the west of Koh Haa Three out toward Koh Haa Yai and Koh Daeng.

The lagoon is usually dived along with Koh Haa Yai or Koh Haa One.

Snorkeling Koh Haa Lagoon

The shallow lagoon at Koh Haa is one of the best snorkeling sites in the Lanta Marine Park, home to thousands of healthy and robust corals, and hundreds of different marine life species.

This is also a fantastic place to see schools of bigeye barracuda, feeding parrotfish, wrasse, snapper, groupers, damselfishes, butterflyfishes, and sometimes hawksbill turtles and baby blacktip sharks in the shallows.

Snorkel @ Koh Haa with Dive & Relax

There is a small sandy beach at the heart of the lagoon where you can swim ashore for a rest, however due to the shallow corals, we can't bring our boats to the beach.

In addition to the coral lagoon, snorkelers can also easily explore the shallow reef areas around islands two and four.

Just under the surface, snorkelers can see crocodile needlefish, fusiliers, sergeant majors, and occasionally juvenile batfish from the school that lives on the outside of Koh Haa island Four.

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 Haa Lagoon
Visibility: 15m - 30m +
Level of Diving: All Levels
Snorkeling: Yes
Depth: 0m - 45m +
Journey Time: 25 - 35 mins
Koh Haa Lagoon 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.


Dive Trips & Scuba Courses

Send us an email and we'll get back to you as soon as possible.

  • 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