Dive-site story
Located north of the main Similan archipelago, Koh Bon stands out as a stark limestone islet rather than the granite boulders found on its southern neighbors. Divers descend primarily onto the dramatic western ridge, a submerged finger of rock that drops away into deep blue water and acts as an active cleaning station for pelagics. Plankton-rich currents sweep across the wall, supporting yellow soft corals, sea fans, and abundant schooling fish.
Cleaning station along the western ridge frequented by oceanic visitors
Sheer limestone drop-offs covered in soft yellow tree corals
Expansive step-reef topography in the sheltered southern bay
Location
Use the map to plan with your operator and confirm the exact entry point on the day.
Seasonality
The national park is open to divers from mid-October through mid-May, with manta ray sightings peaking between January and April.
Marine life
| Species | Likelihood | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Reef Manta RayMobula alfredi | Seasonal | ||||||||||||
| Zebra SharkStegostoma tigrinum | Common | ||||||||||||
| Giant TrevallyCaranx ignobilis | Common | ||||||||||||
| Banded Sea KraitLaticauda colubrina | Common | ||||||||||||
| Whale SharkRhincodon typus | Rare |
Marine forecast
