Koh Ha Lagoon & Cathedral Caverns

A cluster of limestone islets roughly midway between Koh Lanta and Hin Daeng, usually dived on the same day trip or liveaboard. Calmer and shallower than the pinnacles, with swim-through caverns; overhead sections make Advanced sensible.

Depth

5–30m

Current

Mild

Diver level

Advanced open water

Entry

Boat

Unique features

  • Sheltered limestone caverns and a shallow lagoon, often paired with Hin Daeng trips
  • Soft corals, leopard sharks on sand, macro life in the chimneys

Sources & last checked

Checked July 2026

This is a researched draft, not yet human-verified. The seasonality and logistics are drawn from the sources below — confirm specifics (permits, fees, closures) with an operator before you book.

Note on the data: Coordinates are approximate; not surveyed dive-site GPS.