Yom River

The Yom River (Thai: แม่น้ำยม, RTGS: Maenam Yom, pronounced [mɛ̂ː.náːm jōm]) is a river in Thailand. It 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. 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.

Yom River
Yom River in Doi Phu Nang National Park near Chiang Muan
Map of the Chao Phraya River drainage basin showing the Yom River
Location
CountryThailand
Physical characteristics
Source 
 • locationBun Yuen village, Pong district, Phi Pan Nam Range, Phayao Province
 • elevation347 m (1,138 ft)
MouthNan River
 • location
Chum Saeng district, Nakhon Sawan province
 • elevation
28 m (92 ft)
Length700 km (430 mi) [1]
Basin size24,047 km2 (9,285 sq mi)
Discharge 
 • locationNakhon Sawan
 • average103 m3/s (3,600 cu ft/s)
 • maximum1,916 m3/s (67,700 cu ft/s)
Basin features
Tributaries 
 • rightNgao River

Tributaries
Main article: Tributaries of the Chao Phraya River

Tributaries of the Yom include Nam Mae Phong, Ngao River, Nam Ngim, Huai Mae Sin, Nam Suat, Nam Pi, Mae Mok, Huai Mae Phuak, Mae Ramphan, Nam Mae Lai, Nam Khuan, and Nam Mae Kham Mi.

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.[2] 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.[3] The debate about the dam was opened again in 2011.[4] 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.[5]

The Yom River and the Phi Pan Nam Range, Long District, Phrae Province

Protected areas

The Yom River flows through Mae Yom National Park in Phrae Province.

References
  1. "Longest Rivers in Thailand". 25 April 2017.
  2. Basins of Thailand
  3. The Injustice Case of Kaeng Sua Ten Dam Project
  4. Bangkok Post Floodgates reopen in dam debate
  5. Bangkok Post - Study to decide Yom River fate
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19°23′24″N 100°27′18″E

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