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Nam Theun, also known as Khading, is a river in Laos, in Khammouane and Bolikhamsai Provinces. Together with its tributaries Nam One, Nam Noy, and Nam Theun it has total length of 138 km (86 mi) [a] and drains an area of 2,800 km2 (1,100 sq mi). "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 ha national preserve that is one of the protected areas of Laos.