The Yom River ( th, แม่น้ำยม, , ) is a river in

Thailand Thailand ( ), historically known as Siam () and officially the Kingdom of Thailand, is a country in Southeast Asia, located at the centre of the Indochinese Peninsula, spanning , with a population of almost 70 million. The country is bo ...

. It is the main tributary of the

Nan River The Nan River ( th, แม่น้ำน่าน, , ) is a river in Thailand. It is one of the most important tributaries of the Chao Phraya River. Geography The Nan River originates in the Luang Prabang Range, Nan Province. The provinces ...

(which itself is a tributary of the

Chao Phraya River The Chao Phraya ( or ; th, แม่น้ำเจ้าพระยา, , or ) is the major river in Thailand, with its low alluvial plain forming the centre of the country. It flows through Bangkok and then into the Gulf of Thailand. Et ...

). The Yom River has its source in the

Phi Pan Nam Range The Phi Pan Nam Range, also Pee Pan Nam, ( th, ทิวเขาผีปันน้ำ) is a long system of mountain ranges in the eastern half of the Thai highlands. It is mostly in Thailand, although a small section in the northeast is w ...

Pong District Pong ( th, ปง, ) is a district (''amphoe'') of Phayao province in northern Thailand. Geography Neighboring districts are (from the east clockwise) Song Khwae, Tha Wang Pha, Mueang Nan of Nan province, Chiang Muan, Dok Khamtai, Chun an ...

, Phayao Province. Leaving Phayao, it flows through

Phrae Phrae (; ) is a town (''thesaban mueang'') in northern Thailand, capital of Phrae Province. The town occupies ''tambon'' Nai Wiang of Mueang Phrae District. It has an area of nine kilometres2 and a population of 17,971 (2005). Phrae is 555 km no ...

and Sukhothai as the main water resource of both provinces before it joins the Nan River at

Chum Saeng District Chum Saeng ( th, ชุมแสง, ) is a district ('' amphoe'') in Nakhon Sawan province, upper central Thailand. History Chum Saeng is an old district of Nakhon Sawan. The government separated some parts of Mueang Nakhon Sawan district to ...

, Nakhon Sawan Province.

Tributaries

Tributaries of the Yom include Nam Mae Phong,

Ngao River The Ngao River ( th, แม่น้ำงาว, , ) is a river of Thailand with its source in the Phi Pan Nam Range. It is a tributary of the Yom River, part of the Chao Phraya River basin. This river should not be confused with the Ngao River t ...

, Nam Ngim,

Huai Mae Sin Huai Mae Sin ( th, ห้วยแม่สิน, ) is a watercourse of Thailand. It is a tributary of the Yom River, part of the Chao Phraya River The Chao Phraya ( or ; th, แม่น้ำเจ้าพระยา, , or ) is the ma ...

, Nam Suat,

Nam Pi Nam Pi ( th, น้ำปี้, ) is a watercourse in the province of Phayao and Nan, Thailand. It is a tributary of the Yom River, part of the Chao Phraya River The Chao Phraya ( or ; th, แม่น้ำเจ้าพระยา, , ...

, Mae Mok, Huai Mae Phuak,

Mae Ramphan Mae Ramphan ( th, แม่รำพัน, ) is a watercourse in the province of Lampang and Sukhothai, Thailand. It is a tributary of the Yom River, part of the Chao Phraya River The Chao Phraya ( or ; th, แม่น้ำเจ้า� ...

Nam Mae Lai Nam Mae Lai ( th, น้ำแม่หล่าย, ) is a river in Phrae Province of Thailand. It is a tributary of the Yom River The Yom River ( th, แม่น้ำยม, , ) is a river in Thailand. It is the main tributary of the Nan Riv ...

Nam Khuan Nam Khuan ( th, น้ำควร, ) is a watercourse of Thailand. It is a tributary of the Yom River The Yom River ( th, แม่น้ำยม, , ) is a river in Thailand. It is the main tributary of the Nan River (which itself is a tributar ...

, and Nam Mae Kham Mi.

Yom Basin

The Yom river and its tributaries drain a total area of of land (called the Yom Basin) in the provinces of Sukhothai,

Phitsanulok Phitsanulok ( th, พิษณุโลก, ) is an important, historic city in lower northern Thailand and is the capital of Phitsanulok Province. Phitsanulok is home to Naresuan University and Pibulsongkram Rajabhat University, as well as ...

Phichit Phichit ( th, พิจิตร, เมือง) is a town (''thesaban mueang'') in central Thailand, capital of Phichit Province. It covers the whole ''tambon'' Nai Mueang of Mueang Phichit district, an area of 12.017 km². As of 2005 it ...

, and

Lampang Lampang, also called Nakhon Lampang ( th, นครลำปาง, ) to differentiate from Lampang province, is the third largest city in northern Thailand and capital of Lampang province and the Mueang Lampang district. Traditional names for La ...

.Basins of Thailand
/ref> The Yom Basin is part of the Greater Nan Basin and the Chao Phraya Watershed. A controversial large

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use ...

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.Bangkok Post - Study to decide Yom River fate
/ref>

Protected areas

The Yom River flows through

Mae Yom National Park Mae Yom National Park is a national park in Phrae Province, Thailand. The Yom River flows through the park. The land is mountainous and fertile, and there are naturally grown teak trees. Flora The park is in the mountains of the Phi Pan Nam Ra ...

in Phrae Province.

References

External links

Living River SiamBangkok Post - Living in the ugly shadow of the kaeng sua ten damA Never-ending Story… Living with the Forest and Protection of the river fish
{{coord, 19, 23, 24, N, 100, 27, 18, E, region:TH-56_type:waterbody_source:kolossus-frwiki, display=title Rivers of Thailand Nan River