Onkivesi is a rather large lake of Finland. It belongs to the Vuoksi main catchment area. It is located in the Northern Savonia region and mostly in Lapinlahti municipality. Water in the lake is somewhat brownish partly due to natural inflows and partly due to the location in an agricultural area.^[1]

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Onkivesi
Onkivesi
Coordinates	63°18′N 27°18′E
Type	Lake
Basin countries	Finland
Surface area	113.62 km2 (43.87 sq mi)
Average depth	3.2 m (10 ft)
Max. depth	36.5 m (120 ft)
Water volume	0.36 km3 (290,000 acre⋅ft)
Shore length1	440.91 km (273.97 mi)
Surface elevation	84.7 m (278 ft)
Frozen	December–April
Islands	Myhkyrinsaari, Ulmansaari, Viitasaari
Settlements	Lapinlahti, Maaninka
References	[1]
1 Shore length is not a well-defined measure.

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• List of lakes in Finland