|Max. length||8 kilometres (5.0 mi)|
|Max. width||4.5 kilometres (2.8 mi)|
|Surface area||14.26 km2 (5.51 sq mi)|
|Shore length1||43.64 kilometres (27.12 mi)|
|Surface elevation||148 metres (486 ft)|
|1 Shore length is not a well-defined measure.|
Jonsvatnet is a lake in Trøndelag county, Norway. Most of the lake is in the eastern part of the municipality of Trondheim, with a very small part of the shoreline belonging to Malvik municipality. The lake is the main source for drinking water for the city of Trondheim.
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