|Primary inflows||Msta, Lovat, Shelon|
|Catchment area||67,200 km2 (25,900 sq mi)|
|Max. length||40 km (25 mi)|
|Max. width||32 km (20 mi)|
|Surface area||982 km2 (379 sq mi)|
|Max. depth||10 m (33 ft)|
|Water volume||12 km3 (2.9 cu mi)|
|Surface elevation||18 m (59 ft)|
Lake Ilmen (Russian: И́льмень; IPA: [ˈilʲmʲɪnʲ]) is a historically important lake in the Novgorod Oblast of Russia, formerly a vital part of the Trade route from the Varangians to the Greeks. The city of Novgorod lies six kilometers below the lake's outflow.
According to the Max Vasmer's Etymological Dictionary, the name of the lake originates from the Finnic "Ilmajärvi", which means "air lake". There are many lakes in Russia with their names being derivative from Lake Ilmen.
The average surface area is 982 square kilometres (379 sq mi) (it may vary between 733 square kilometres (283 sq mi) and 2,090 square kilometres (810 sq mi) depending on water level). The lake is fed by 52 inflowing rivers, the four main ones being the Msta, the Pola, the Lovat, and the Shelon. It is drained through a single outlet, the Volkhov, into Lake Ladoga, and subsequently via the Neva into the Gulf of Finland. The source of the Volkhov is marked by the Peryn Chapel built in the 1220s.
The water level is regulated by the Volkhov hydroelectric plant situated downstream the Volkhov River. Water temperature in July is 19-20 °C. Bathing season is about 90 days.
Media related to Ilmen Lake at Wikimedia Commons