Koh Haa
Five limestone islands around a sheltered lagoon, with cavern walls that divers call the Cathedral.
Photo: Thomas Quine · CC BY-SA 2.0
Koh Haa means "five islands", and they sit in a loose ring that shelters a lagoon in the middle. That lagoon is the reason this is such a reliable snorkel site: even when it is choppy outside, the inner water stays flat.
The Cathedral is a set of connected caverns on the western island. Divers go inside; from the surface you can still look straight down the walls, which drop away into deep blue.
Visibility here is the best within easy reach of Lanta, and the site works year-round more reliably than the further-out islands.
Trips that visit Koh Haa
Bestseller Full day Koh Rok & Koh Haa
The best visibility in the Andaman, in one day
Stops Koh Rok Nai · Koh Rok Nok · Koh Haa
Best snorkelling Half day Koh Haa Half Day
The clearest water on the island, back by lunch
Stops Koh Haa
Best snorkelling
Private charter Private Speedboat Charter
Further, faster, on your own terms
Stops Koh Rok · Koh Haa · Phi Phi +2
Best for groups