Nam Theun (also known as ''Khading''), is a river in

Laos Laos, officially the Lao People's Democratic Republic (LPDR), is the only landlocked country in Southeast Asia. It is bordered by Myanmar and China to the northwest, Vietnam to the east, Cambodia to the southeast, and Thailand to the west and ...

, in Khammouane and

Bolikhamsai Province Bolikhamsai (, ), formerly gallicized as Borikhamxay, is a province of Laos. Pakxan, Thaphabat, Pakkading, Borikhane, Viengthong, and Khamkeut are its districts and Pakxan is its capital city. The province is the site of the Nam Theun 2 Dam, ...

s. Together with its tributaries Nam One, Nam Noy, and Nam Theun it has total length of and drains an area of . "Nam Theun" is also three options for large dams on the same river, called Nam Theun 1, Nam Theun 1-2 and Nam Theun 2. Nam Theun 2, which was considered the most economic of the three options, is in operation. Part of the river corridor is a 62,000

hectare The hectare (; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm2), that is, square metres (), and is primarily used in the measurement of land. There are 100 hectares in one square kilometre. ...

national preserve that is one of the protected areas of Laos.

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Rivers in Laos
Rivers of Laos Tributaries of the Mekong River {{Laos-river-stub