Koh Haa Lagoon is probably the most visited diving and snorkelling sites of the Koh Haa mini archipelago. This doesn’t mean it’s the most exciting or best, but it certainly has something for just about everyone. It’s suitable for snorkelling and various different scuba divers.

The Cathedral is by far the most famous and exciting of the dive sites at Koh Haa. Its name comes from the spectacular views in the safe cavern which divers are able to surface inside. Although not many large sharks and rays are seen here, the topography and smaller creatures make this a ‘must visit’ for all certified divers from Koh Lanta.

The Chimney is among the top three diving spots in Koh Haa, and is famous for its amazing swimthrough and cave system. Koh Lanta divers love coming here to get a thrill out of The Chimney, but also to enjoy the crystal-clear waters and healthy marine life around it.

Although most divers and Koh Lanta diving centers talk about and focus on the three main dive sites at Koh Haa, there are up to ten other great dive sites there too. These are usually incorporated in visits to the ‘Top Three’ but are still named and visited independently buy some.

In front of The Lagoon main beach of Island 3 are two limestone islets. Although these are mostly dived as part of The Lagoon dive site itself, some divers choose to stay out away from the shallows and explore the outer reefs of Islands 2 & 4.

Island 3 is the long thin island in the center of Koh Haa. It is home to The Lagoon, but also has a few other good diving spots dotted around the island on its north and south ends as well as behind the main beach.

The largest island of the Koh Haa Archipelago is Island 5, located furthest south. It is home to ‘The Cathedral’ but also has a few other good diving spots for when conditions or crowded areas make trying somewhere else a good idea. They are more exposed to the sea and weather conditions, but can be great for spotting large filter feeders on lucky days.