Richelieu Rock

A standalone limestone pinnacle in the Surin park, roughly 40-80km northwest of Khao Lak near the Myanmar border. Liveaboard-only. Strong, shifting currents; peak whale-shark odds February-April coincide with plankton that can lower visibility.

Depth

5–35m

Current

Strong

Diver level

Advanced open water

Entry

Boat

Unique features

  • Horseshoe-shaped pinnacle rising to 2-3m below the surface
  • Thailand's most reliable whale-shark and manta site
  • Dense macro — seahorses, ghost pipefish, harlequin shrimp — plus barracuda and tuna schools

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.