The Salween River begins its journey at 4,000 meters above sea level, high on the Tibetan Plateau in the Himalayas. It runs through the mountains of Yunnan Province in China, passing through Shan and Karenni states in eastern Burma before forming the border between Burma and Thailand for about 120 kilometers. It continues south through Burma before reaching the Andaman Sea in the Gulf of Martaban at Mawlamyine, Mon State.