Tortgul Reservoir
The Tortgul Reservoir in 2016
Tortgul Reservoir
Location	Batken District, Batken Region, Kyrgyzstan
Coordinates	39°59′34.7″N 70°41′46.8″E / 39.992972°N 70.696333°E / 39.992972; 70.696333
Primary inflows	Isfara River
Primary outflows	Isfara River
Basin countries	Kyrgyzstan and Tajikistan
Built	1971 (1971)–1972 (1972)
First flooded	1975 (1975)
Surface area	6.57 km2 (2.54 sq mi)
Water volume	90×10^6 m3 (73,000 acre⋅ft)

The Tortgul Reservoir or Tortkul Reservoir (Kyrgyz: Төртгүл / Төрткүл суу сактагычы; Russian: Торткульское водохранилище) is a reservoir on the Isfara River in Batken District, Batken Region of Kyrgyzstan near the border with Tajikistan. The reservoir has two outflow canals, with one flowing into Batken District and the other diverting water back into the Isfara River.^[1] It has a maximum surface area of 6.57 square kilometres (2.54 sq mi) and an estimated volume of 0.09 cubic kilometres (0.022 cu mi).^[2]

The reservoir was built in 1971^[1] or 1972^[2] and began operation in 1975.^[1] The reservoir was designed by the Soviet Water Planning Institute and the Kyrgyz Water Planning Institute in 1968. The following year its operation was approved by the USSR Ministry of Water Resources. Because of its role in regulating the waters of the Isfara river, the Tortgul Reservoir has featured in water disputes between Kyrgyzstan, Tajikistan, and Uzbekistan ever since its completion.^[1]