Koh Chang

Koh Chang (Elephant Island) is Thailand's third-largest island and one of its most geographically dramatic — a rugged, jungle-covered mountain rising from the Gulf, with steep waterfalls plunging through rainforest to white-sand beaches, coral reefs in the clear east-coast water, and an atmosphere significantly wilder than the heavily developed southern islands. Located in Trat province just 10 km from the Cambodian border, it is accessible from Bangkok in roughly 5–6 hours (bus plus car ferry), making it a favourite long-weekend escape for Thai and expat visitors from the capital.

The island is large enough (212 km²) that development remains concentrated on the northwest coast — primarily White Sand Beach (Hat Sai Khao) and Lonely Beach — while the east coast and the mountainous interior remain almost entirely uninhabited forest. The interior is crisscrossed by jungle streams and four main waterfall systems: Klong Plu (the most visited, with a 20-metre cascade into a swimming pool), Than Mayom (two-tiered falls with a Royal Residence plaque), Klong Nonsi, and the more remote Khiri Phet. Elephant trekking was historically the island's primary cultural activity — the name alone makes the expectation clear — though ethical encounters are increasingly available.

The coral reefs off Koh Chang and the nearby Mu Koh Chang Marine National Park are some of the best in the Gulf of Thailand, with reasonable visibility (5–15 m) and a good selection of hard and soft coral at accessible depths. The islands south of Koh Chang — Koh Kood, Koh Mak, and Koh Wai — are even less developed, offering day trip or overnight options for those seeking maximum solitude.