Koh Chang offers a varied mix of reef and wreck diving in Thailand’s eastern Gulf, with dive sites around the island and the nearby Koh Rang archipelago. Discover local diving, explore the area’s underwater world and start planning your next dive trip.
Discover dive centers in Koh Chang and connect with local professionals for fun dives, courses and trips to the area’s reefs and wrecks.
👉 Explore all dive centers in Koh Chang
Koh Chang is one of Thailand’s diving destinations in the eastern Gulf, offering a mix of coral reefs, rocky dive sites and wreck diving. Dive sites are spread around the island and the nearby Koh Rang archipelago, with options ranging from sheltered reefs to deeper wrecks.
The HTMS Chang is the area’s best-known dive site and has developed into a large artificial reef since it was sunk in 2012. Alongside the wreck, sites such as Hin Luk Bat and Hin Raab provide reef diving suitable for different experience levels.
The best overall conditions for diving in Koh Chang are generally found from November to April, during the drier season. Seas are typically calmer and visibility is often better, making this a popular period for exploring the reefs and the HTMS Chang wreck.
Diving is also possible outside the main season, although the monsoon months from May to October can bring rougher seas and reduced visibility. Dive schedules and available sites may therefore vary according to weather and sea conditions.
Water temperatures around Koh Chang remain warm throughout the year and are generally around 28–30°C. Visibility varies between dive sites and conditions, but can reach around 20–30 metres during favourable conditions in the dry season.
Many reef sites offer relatively sheltered conditions and gentle currents, making Koh Chang suitable for less experienced divers. Deeper sites such as the HTMS Chang require more experience and appropriate certification, while conditions should always be considered when selecting a dive site.
The waters around Koh Chang support a varied mix of tropical marine life. Divers can encounter barracuda, moray eels, batfish, grouper, stingrays, turtles, nudibranchs and numerous smaller reef species among the coral reefs and rocky formations.
The HTMS Chang has become an important artificial reef and attracts large schools of fish around its structure. Larger species, including whale sharks, are occasionally encountered in the wider Koh Chang area, but sightings are never guaranteed.
Most diving in Koh Chang is organised through local dive centers, with boat trips visiting reefs, rocky sites and wrecks around the island and the Koh Rang archipelago. Well-known dive sites include Hin Luk Bat, Hin Raab and the HTMS Chang, giving divers a combination of reef and wreck diving.
The variety of sites provides options for different experience levels, from relaxed reef dives and training dives to deeper wreck diving. Check current dive schedules, weather conditions and suitable sites with a local dive center when planning your diving days.
The best overall conditions for diving in Koh Chang are generally found from November to April, when seas are typically calmer and visibility is often better. These months are ideal for exploring the coral reefs and the HTMS Chang wreck.
Yes. Diving around Koh Chang is possible throughout the year, although conditions vary by season. From May to October, the monsoon can bring rougher seas and reduced visibility, but sheltered dive sites may still be accessible.
Yes. Koh Chang offers sheltered reef sites and generally gentle currents, making several locations suitable for beginners and training dives. Deeper wreck dives, including parts of the HTMS Chang, require more experience and the appropriate certification.
Water temperatures around Koh Chang remain warm throughout the year and are generally around 28–30°C, providing comfortable diving conditions in every season.
The HTMS Chang is Koh Chang’s best-known dive site and is one of Thailand’s most impressive wreck dives. Other popular sites include Hin Luk Bat, Hin Raab and the coral reefs of Koh Rang National Park, offering a mix of wreck, reef and pinnacle diving.
Divers can encounter barracuda, moray eels, batfish, grouper, stingrays, turtles, nudibranchs and a variety of tropical reef fish. Larger species, including whale sharks, are occasionally encountered around Koh Chang, but sightings are never guaranteed.
