Ko Chang (also Koh Chang) is an amphoe (district) in Trat Province, Thailand. It is located on the Gulf of Thailand's eastern seaboard, 310 km from Bangkok and near the border with Cambodia.
It is the country's second largest island, and the largest island in the Mu Ko Chang National Park archipelago.
The name means Elephant Island, and comes from the elephant shape of its headland. Despite the presence of elephants on the island, they are not indigenous to the island. At present, there are 9 villages on the island.
It is a mountainous island, with Khao Salak Phet being the highest peak at 743 metres. The island is known for several waterfalls, thriving coral reefs and rainforests.