The River Kwai, more correctly Khwae Noi (Thai: แควน้อย, IPA: [kʰwɛː nɔ́ːj], "small tributary") or Khwae Sai Yok (Thai: แควไทรโยค  [kʰwɛː saj jôːk]), is a river in western Thailand. It rises to the east of the Salween in the north-south spine of the Bilauktaung range near, but not over the border with Burma. It begins at the confluence of Ranti, Songkalia and Bikhli Rivers.