Koh Bon (West Ridge)

A sloping ridge and wall north of the Similans, reached by liveaboard or long day trip. Reef mantas patrol the cleaning stations, most often in the dry season; not guaranteed. Advanced-level for the current.

Depth

5–40m

Current

Strong

Diver level

Advanced open water

Entry

Boat

Unique features

Limestone ridge running off the island's western tip
The region's most reliable reef-manta cleaning station
Currents often stronger here than the Similans proper

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.

Diving the Similan and Surin Islands — ZuBlu
Similan dive sites — Big Blue Diving Khao Lak

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