Independent site page with depth and reef-profile context.
Thailand · Trat and the Koh Chang Archipelago
Koh Chang rocky reef with coral, turtles, and barracuda.
Koh Chang rocky reef with coral, turtles, and barracuda.
Boat logistics and route planning are easiest with a Koh Chang operator.
Hin Raab is a rocky Koh Chang site with coral around the main reef and enough structure to hold a wide mix of fish. Divers come here for turtles, stingrays, barracuda, groupers, and the occasional bigger surprise, while the nearby Secret Reef and T11 area add more variety to the same boat run. It is a boat dive that rewards steady buoyancy and a plan that keeps the team moving along the rock rather than chasing depth.
Site Conditions
Safety Notes
Keep the team tight on the reef, manage buoyancy around the boulders, and treat the deeper side and wreck-side features as the parts that need the most discipline.
Access Restrictions
Boat access from Koh Chang operators is the normal route; this is not a shore-entry site.
Legal Notes
Follow Koh Chang marine-park rules and any seasonal closure notices or operator rules in force.
Community notes to help plan your visit.
Scuba Diving
Boat-access reef around a rocky core with a deeper side, coral patches, and a route that can extend to Secret Reef and the T11 area.
Freediving
Only the shallow reef edge is sensible for breath-hold work; the full area is really a scuba circuit.
Snorkeling
Snorkeling is limited to the calmest shallow patches and is not the main use case.
Species commonly reported at this site, with direct links into their wildlife guides.
Conservative baseline from public research. No community dives logged yet.
Last Updated
Research Sources
Independent site page with depth and reef-profile context.
Koh Chang operator page listing Hin Raab among the island's major dive sites.
Independent Koh Chang dive-site guide listing Hin Raab among the area sites.

Secret Reef: Koh Chang coral garden canyon

Koh Chang twin-pinnacle reef with corals, canyon, and turtles.

Boat wreck dive with big fish schools and penetration potential.