The Kyiv Reservoir (Ukrainian: Київське водосховище, romanized: Kyivs’ke vodoskhovyshche), locally the Kyiv Sea (Ukrainian: Київське море, romanized: Kyivske more), is a large water reservoir located on the Dnipro River in Ukraine. Named after the city of Kyiv, which lies to the south, it covers an area of 922 square kilometres (356 sq mi) within the Kyiv Oblast. The reservoir filled in 1964–1966 after the dam for the Kyiv Hydroelectric Power Plant was built at Vyshhorod. The reservoir is mainly used for hydroelectricity generation, industrial and public consumption, and irrigation.
The reservoir is 110 km in length, 12 km in width, has a depth of four to eight meters, a volume of 3.7 km (0.89 cu mi), and a usable volume of 1.2 km (0.29 cu mi). The reservoir, together with the Kakhovka Reservoir (destroyed in 2023 during Russian invasion of Ukraine), the Dnieper Reservoir, the Kamianske Reservoir, the Kremenchuk Reservoir, and the Kaniv Reservoir, has created a deep-water route on the river. However, its creation has also contributed to significant environmental problems such as the diminished flow velocity which reduces water oxygenation, and has a negative result on the balance of aquatic life forms. Also, some nearby villages were flooded when it filled. One of these was Teremtsi, where the residents of the village persuaded Soviet authorities to let them stay, only to be evacuated later in 1986 during the Chernobyl disaster.
