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|Primary inflows||Ketahun River & Pauh River|
|Primary outflows||Air Putih River|
|Catchment area||10 km2 (3.9 sq mi)|
|Max. length||5 km (3.1 mi)|
|Max. width||1 km (0.62 mi)|
|Surface area||5 km2 (1.9 sq mi)|
|Average depth||10 m (33 ft)|
|Max. depth||56 m (184 ft)|
|Water volume||0.05 km3 (41,000 acre⋅ft)|
|Shore length1||4 km (2.5 mi)|
|Surface elevation||1 m (3 ft 3 in)|
|Islands||Bungin Ialand, Pasir Island, Titik Island, Saweak Island & Ujung Island|
|1 Shore length is not a well-defined measure.|
Tes Lake is one of the largest lakes in Bengkulu Province, Indonesia. Tes Lake is the main hydroelectric (hydropower) supplier for nearly all of Bengkulu Province. The lake covers an area of approximately 750 hectares.
According to the Decree of Forestry Minister No. 385/Kpts-II/1985, dated December 27, 1985, Tes Lake covers an area of 3,230 hectares.
Because of its hot and humid climate, crops such as coffee are mainly grown. Other florae that grow around the area are Meranti, Dyera costulata, Kayu Gadis, Pulai, Gelam, and other plants which also grow elsewhere in Bengkulu Province.
Tes Lake is home to a variety of wildlife, including tigers, gibbons, monkeys, snakes, bears, various domestic birds, dogs, several species of domestic fish, and other creatures.
Its elevation is 600m to 900m above sea level.
Geology and climate
Based on information from an exploration conducted in 1964, the main types of soil found in Tes Lake are regosol, andosol, latosol, and podzol (brown podzol soil).
Due to its high number of wet seasons, Tes Lake experiences an average annual rainfall intensity of 2,700-3,500 mm. According to classifications from Schmidt and Ferguson, the area is classified as type A, with a Q value of approximately 0.9% - 7.7%. 
- Usman, Mardiansyah; Suhartoyo, Hery (18–22 January 2021). Danau Tes dalam Pengelolaan Taman Wisata Alam di Hulu DAS (Daerah Aliran Sungai) Ketahun, Provinsi Bengkulu [Lake Tes Natural Tourism Park Management in the Upper Ketahun Watershed, Bengkulu Province]. International Lake Environment Committee (Indonesia-Japan) Tranining - Indonesia Lake Conservation Programme. pp. 1–6. Retrieved 5 December 2021.