Jambi is a city in Indonesia, capital of Jambi province, on the island of Sumatra. The city is a busy port on the Hari River and an oil- and rubber-producing centre. The city is located 26 km from the ruins of Muara Jambi, an important city in the ancient Srivijaya kingdom. Sumatra (also spelled Sumatera) is the sixth largest island of the world (approximately 470,000 km²) and is the largest island entirely in Indonesia (two larger islands, Borneo and New Guinea, are partially in Indonesia). ... Muaro Jambi is a regency of Jambi, Indonesia. ... Map of Southeast Asia at end of 12th century. ...