As of 2026-10-12, Foss Reservoir tops the list with 538,800 km3.
- #1 Foss Reservoir — 538,800 km3
reservoir in Oklahoma, USA
Foss Reservoir, also known as Foss Lake, is in Custer County, Oklahoma on the Washita River, about 15 miles (24 km) west of Clinton, Oklahoma. The reservoir was constructed during 1958–1961 by the U. S. Bureau of Reclamation. The project was known originally as the Washita Basin Project. The lake and dam were named for the community of Foss, Oklahoma, about 6 miles (9.7 km) south of the site. Their primary purpose is to regulate flow of the river and to provide water for the cities of... Read more on Wikipedia.
Wikidata - #2 Mavrovo Lake — 357,000 km3
reservoir in Macedonia
Mavrovo Lake is situated in the Mavrovo region, in the Mavrovo and Rostuša municipality, Gostivar in the Republic of North Macedonia, less than 100 km from Skopje. It is an important tourist destination, being frequented for recreational activities such as swimming, boating and trout fishing during the summer; a distinctive building in the lake is the half-submerged church of Saint Nicholas. Since 1952 it is part of the Mavrovo National Park. With its surface of 13.7 km2, is one of the most... Read more on Wikipedia.
Wikidata - #3 Schluchsee — 108,000 km3
lake in Germany
The Schluchsee is a reservoir lake in the district of Breisgau-Hochschwarzwald, southeast of the Titisee in the Black Forest near Freiburg im Breisgau, Germany. Read more on Wikipedia.
Wikidata - #4 Stanley Reservoir — 10,000 km3
reservoir in India
Stanley Reservoir located in Salem District of Tamil Nadu is one of largest fishing reservoirs in South India. It was completed in 1934 and was named after Lieutenant Colonel Sir George Frederick Stanley GCSI GCIE CMG, who served as the Governor of Madras from 1929 to 1934. Its main source of water is the River Kaveri (Cauvery). Three minor tributaries – Palar, Chennar and Thoppar – join the Kaveri above Stanley Reservoir. The water is retained by the Mettur Dam, Tamil Nadu. Read more on Wikipedia.
Wikidata - #5 Xiaowan Reservoir — 418 km3
reservoir in People's Republic of China
source Wikidata - #6 Kayrakkum Reservoir — 416 km3
Artificial lake in Sughd Province, Tajikistan (Also Known as "Bahri Tajik")
Kayrakkum Reservoir, also spelled variously as Qayroqqum, Qayraqqum, Kayrakum or Kairakum, is a large artificial lake in Ghafurov District of Sughd Province, in northwestern Tajikistan. In 2016, the reservoir was renamed Tajik Sea by the country's parliament. The reservoir lies in the western part of the Fergana Valley on the Syr Darya river. The provincial capital of Khujand lies about 15 km (9.3 mi) west of the dam. It is also a Ramsar site. Read more on Wikipedia.
Wikidata - #7 Toktogul Reservoir — 195 km3 source Wikidata
- #8 Lake Kariba — 180 km3
reservoir in Zimbabwe
Lake Kariba is the world's largest artificial lake and reservoir by volume. It lies 1,300 kilometres (810 mi) upstream from the mouth of the Zambezi river on the Indian Ocean, bordering Zambia and Zimbabwe. Lake Kariba was filled between 1958 and 1963 following the completion of the Kariba Dam at its northeastern end, flooding the Kariba Gorge on the Zambezi River. Read more on Wikipedia.
Wikidata - #9 Bratsk Reservoir — 169 km3
reservoir in Irkutsk Oblast, Russia
Bratsk Reservoir (Russian: Братское водохранилище, romanized: Bratskoye vodokhranilishche) is a reservoir on the Angara River, located in the Lena-Angara Plateau of Irkutsk Oblast, Russia. It is named after the city of Bratsk, the largest city adjacent to the reservoir. It has a surface area of 5,470 km2 (2,110 sq mi) and a maximum volume of 169.27×1012 litres (3.723×1013 imp gal; 4.472×1013 US gal). Read more on Wikipedia.
Wikidata - #10 Lake Volta — 148 km3
world's largest man-made reservoir by surface area, located in Ghana
Lake Volta, the largest artificial reservoir in the world by surface area, is contained behind the Akosombo Dam which generates a substantial amount of Ghana's electricity. It is completely within the country of Ghana and has a surface area of 8,502 square kilometres (3,283 sq mi). It extends from Akosombo in the south to the northern part of the country southwest of Tamale. Read more on Wikipedia.
Wikidata