Salween River much of its length, the Salween's course is nearly parallel to that of the much larger Mekong in the east. Although the commonly accepted name is Salween, the river is known by a handful of other names regionally: "Nu" in China, "Thanlwin" in southern Burma, and "Salawin" on the border of Thailand and Burma. Several major sub-continental drainage basins border on the Salween. The Mekong basin forms nearly the entire eastern boundary of the watershed, while the Irrawaddy River flows southwards on the west side of the basin. The smallest boundary is formed by the Yangtze to the extreme north.
Kok River Kok River The Kok River (, , ) flows in Southeast Asia. The river originates in the Daen Lao Range, Shan State, Burma. It flows eastwards across the Burma-Thailand border, coming in at the Thai border town of Tha Ton (, also spelled Thaton ). It flows to Mae Ai district, Chiang Mai Province. Most of its length in Thailand is in Chiang Rai Province where it passes Mueang Chiang Rai District after which it bends northeastwards and flows through Mae Chan, Wiang Chai and Chiang Saen districts. It is a wide, shallow, and slow-moving river. There is about of