Because there’s just one main tide a day in the inner Gulf, the reefs of the Ko Chang archipelago are much less colourful and varied than Andaman coast dive sites, and they can get very crowded, but they’re rewarding enough to make a day-trip worthwhile. The main dive and snorkel sites are west of Ko Mak, in the national marine park around Ko Rang and its satellite islets. These range from beginners’ reefs with lots of hard corals and anemones at depths of 4–6m, frequented by plenty of reef fish – including a resident ten-thousand-strong shoal of yellow fusiliers – and the occasional moray eel, to the more challenging 25m dive at the Pinnacles. There are also some technical wreck dives of Japanese boats from World War II and even some centuries-old Chinese trading ships. The coral around Ko Yuak, off Ko Chang’s Hat Kai Bae, is mostly dead, though some operators still sell trips there.

From about November to May, several companies run dedicated snorkelling trips to reefs and islands around Ko Chang, Ko Wai and Ko Rang. Tickets are sold by tour agents on every beach and prices range from B600 to B1500, depending on the size of the boat (some take as many as a hundred people in high season) and the number of islands visited. In general the more islands “featured” (sailed past), the less time there is for snorkelling, though nearly all the actual snorkelling happens around Ko Rang.

Book through Rough Guides’ trusted travel partners

Thailand features

The latest articles, galleries, quizzes and videos.

Off the tourist trail in Southeast Asia: 5 underrated cities

Off the tourist trail in Southeast Asia: 5 underrated cities

Modern Bangkok, historical Hanoi and tourism-boom town Siem Reap — home to the world-famous Angkor Wat temples — are some of Southeast Asia's best drawcards…

21 Nov 2017 • Marco Ferrarese insert_drive_file Article
Video: a 1 minute guide to Thailand

Video: a 1 minute guide to Thailand

Whether you're planning a two-week holiday or an epic backpacking trip, Thailand remains one of our readers' favourite destinations, and with good reason. Th…

01 Nov 2017 • Colt St. George videocam Video
Budget trips: 20 of the cheapest places to travel

Budget trips: 20 of the cheapest places to travel

That ever-growing travel wish list might be putting some pressure on your pocket – but there are plenty of destinations where you'll get more bang for your b…

11 Oct 2017 • Emma Gibbs camera_alt Gallery
View more featureschevron_right