Koh Chang Hotels Thailand Koh Chang A "Virgin" island located at the Eastern Sea of Thailand where every leisure travelers longing to visit. The largest among the 52 islands of Trat province, is also the nation's second largest island, after Phuket. Covering an area of 429 sq. kms., it features fine beaches, coral reefs, and plentiful marine life. It is also rich in natural resources, teeming with hills, forests, waterfalls and streams, the latter being an important source of freshwater. Dotting the island are many fruit orchards. Most of the scenic beaches and bays are located on the western side, extending from the north to the south.