Ko Chang (Thai: เกาะช้าง, pronounced [kɔ̀ʔ t͡ɕʰáːŋ]) is an amphoe (district) in Trat Province, Thailand. It is on the Gulf of Thailand's eastern seaboard, 310 km from Bangkok, near the border with Cambodia.Ko Chang (Chang Island) is the most notable geographic feature in the district. Ko Chang by itself occupies 212.947 km2. The district of which it is part occupies some 419 km2.
Confusion has arisen over the size of Ko Chang and whether it is the second (after Phuket) or third (after Phuket and Ko Samui) largest island in Thailand. The confusion likely arises from Ko Chang's inclusion in the Ko Chang District (419 km2) and as the largest island of the Mu Ko Chang National Park (650 km2).Ko Chang means 'Elephant Island' and derives from its elephant-shaped headland. Despite the presence of elephants on the island, they are not indigenous. At present, there are eight villages on the island.