- right Ngao River - elevation 28 m (92 ft) Discharge 103 m³/s Country Thailand | - elevation 347 m (1,138 ft) Length 700 km Basin area 23,616 km² Basin 24,047 km2 (9,285 sq mi) | |
 | ||
- location Bun Yuen village, Pong district, Phi Pan Nam Range, Phayao Province - location Chum Saeng district, Nakhon Sawan province - average 103 m/s (3,637 cu ft/s) Mouths Nan River, Chum Saeng District | ||
The Yom River (Thai: แม่น้ำยม, rtgs: Maenam Yom, [mɛ̂ːnáːm jom]) is the main tributary of the Nan River (which itself is a tributary of the Chao Phraya River). The Yom river has its source in the Phi Pan Nam Range in Pong district, Phayao Province, Thailand. Leaving Phayao, it flows through Phrae and Sukhothai as the main water resource of both provinces before it joins the Nan River at Chum Saeng district, Nakhon Sawan Province.
Contents
Map of Yom, Thailand
Tributaries
Tributaries of the Yom include Pong, Ngao, Ngim, Sin, Suat, Pi, Mok, Phuak, Ramphan, Lai, Khuan and Kam Mi Rivers.
Yom Basin
The Yom river and its tributaries drain a total area of 24,047 square kilometres (9,285 sq mi) of land (called the Yom Basin) in the provinces of Sukhothai, Phitsanulok, Phichit, Phrae and Lampang. The Yom Basin is part of the Greater Nan Basin and the Chao Phraya Watershed.
A controversial large dam was planned on the Yom River in the central area of the Phi Pan Nam mountains in Kaeng Suea Ten in 1991 but the project was later abandoned. The debate about the dam was opened again in 2011. Currently a proposal is being debated to build two smaller dams on the Yom River in the area instead of the Kaeng Suea Ten mega-dam.
Protected areas
The Yom River flows through Mae Yom National Park in Phrae Province.