The Pa Sak River ( th, แม่น้ำป่าสัก, ,
Pronunciation
is a river in central

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 ...

. The river originates in the

Phetchabun Mountains The Phetchabun mountains ( th, ทิวเขาเพชรบูรณ์, , ) are a mountain massif in Phetchabun, Phitsanulok, Loei and Chaiyaphum Provinces, Thailand. It consists of two parallel mountain chains, with the valley of the Pa Sa ...

, Dan Sai District, Loei Province, and passes through

Phetchabun Province Phetchabun ( th, เพชรบูรณ์, ) is one of Thailand's seventy-six provinces (''changwat'') lies in lower northern Thailand. Neighbouring provinces are (from north clockwise) Loei, Khon Kaen, Chaiyaphum, Lopburi, Nakhon Sawan, P ...

as the backbone of the province. It then passes through the eastern part of Lopburi Province and Saraburi Province, until it joins the

Lopburi River The Lopburi River ( th, แม่น้ำลพบุรี, , ) is a tributary of the Chao Phraya River in central Thailand. It splits from the Chao Phraya river at Tambon Bang Phutsa, Singburi. Passing through Tha Wung district and the town of ...

northeast of Ayutthaya Island, before it runs into 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 ...

southeast of

Ayutthaya Ayutthaya, Ayudhya, or Ayuthia may refer to: * Ayutthaya Kingdom, a Thai kingdom that existed from 1350 to 1767 ** Ayutthaya Historical Park, the ruins of the old capital city of the Ayutthaya Kingdom * Phra Nakhon Si Ayutthaya province (locally ...

near Phet Fortress. It has a length of and drains a watershed of . The annual discharge is . The valley of the Pa Sak through the

Phetchabun mountains The Phetchabun mountains ( th, ทิวเขาเพชรบูรณ์, , ) are a mountain massif in Phetchabun, Phitsanulok, Loei and Chaiyaphum Provinces, Thailand. It consists of two parallel mountain chains, with the valley of the Pa Sa ...

is a dominant feature of Phetchabun Province. Water levels vary seasonally. To address drought problems in the lower Pa Sak valley, in 1994 the construction of the

Pa Sak Cholasit Dam The Pa Sak Jolasid Dam or Pa Sak Cholasit Dam ( th, เขื่อนป่าสักชลสิทธิ์, ) impounds the Pa Sak River at Ban Kaeng Suea Ten, Tambon Nong Bua, Phatthana Nikhom District, Lopburi Province, and Ban Kham Phra ...

(เขื่อนป่าสักชลสิทธิ์) in Lopburi Province was built. The wide and high dam retains of water. The dam also supplies about 6.7 MW of electricity.

Tributaries

Tributaries of the Pa Sak include the

, Khlong Muak Lek, Huai Nam Phung,

Huai Pa Daeng Huai Pa Daeng ( th, ห้วยป่าแดง, ) is a watercourse of Thailand. It is a tributary of the Pa Sak River, part of the Chao Phraya River basin. In English it can be translated as the "Red Forest Stream", the "Stream of the Deciduous ...

, Khlong Lam Kong,

Lam Sonthi Lam Sonthi (, ) is a tributary of the Pa Sak River. It originates at the Ruak and Phanghoei mountains in the border area of Amphoe Lam Sonthi, Lam Sonthi district, Lopburi province and Amphoe Si Thep, Si Thep, Phetchabun province. The river flows s ...

, Khlong Wang Chomphu, Khlong Huai Na, Huai Nam Chun, Huai Nam Duk,

Huai Khon Kaen Huai Khon Kaen ( th, ห้วยขอนแก่น, ) is a watercourse in Phetchabun Province, Thailand. It is a tributary of the Pa Sak River, part of the Chao Phraya River basin. Khon Kaen Khon Kaen ( th, ขอนแก่น, ) is one ...

, Huai Yai,

Khlong Saduang Yai Khlong Saduang Yai ( th, คลองสะดวงใหญ่, ) is a watercourse of Thailand. It is a tributary of the Pa Sak River The Pa Sak River ( th, แม่น้ำป่าสัก, , Pronunciation is a river in central Thailand. ...

, Khlong Ban Bong, Khlong Tarang, and Lam Phaya Klang.

Pa Sak Basin

The Pa Sak drains an area of . The Pa Sak Basin is part of the Chao Phraya watershed.

References

External links

The Pasak Jolasit Dam project
Rivers of Thailand {{Thailand-river-stub