Wrecks, coral gardens, and slow-island beach days in Thailand's eastern Gulf
Overview
Trat Province's island chain delivers an easy, multi-island Thailand dive trip without long travel days. Base on rainforest Koh Chang for boat diving and the headline HTMS Chang wreck, then slow down on tiny Koh Mak or palm-lined Koh Kood for shallow reefs, beach time, and sunset sessions. Much of the archipelago sits inside Mu Ko Chang National Park, so day trips often combine coral gardens, beginner-friendly depths, and clear-water snorkeling. Conditions are generally warm year-round, with the driest, calmest seas from November to April. May to October brings heavier rain and rougher crossings, but also greener jungle and stronger waterfalls.
Much of the island chain sits inside Mu Ko Chang National Park, protecting coral reefs around islands like Koh Wai and the Koh Rang group.
The HTMS Chang Wreck delivers big structure and fish life for advanced depth profiles, while nearby reefs keep the trip beginner-friendly.
Koh Chang, Koh Mak, and Koh Kood are close enough to combine in one week, so you can mix diving, snorkeling, cycling, and waterfall days without domestic flights.
Quick shortlist before you jump into the full planning page.
View On MapA pinnacle dive often described as an underwater cathedral, with interesting structure and marine life down to about 30 m.
Shallow coral structure down to about 18 m with good variety of reef fish.
A compact reef around 12 m that DiveJourney lists as a snorkeling site, with regular sightings of turtles and common reef fish.
Top species linked to approved dive spots in Trat and the Koh Chang Archipelago.
Expect tropical water temperatures around 27°C to 30°C most of the year; many divers are comfortable in a rashguard or 3mm.
9 linked spots
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