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|Max. length||27.45 km|
|Max. width||2.4 km|
|Surface area||3,219 ha|
|Max. depth||13 m|
Jeziorak (German: Geserichsee) is a lake in the Iława Lakeland in Warmia-Masuria, Poland. Its area is 3,219 ha (including 20 islands with area of 240 ha). It is 27.45 km long and 2.4 km wide. Maximum depth is 13 m. It is the longest lake in Poland, and ranks 6th by area.
The lake was formed by filling a glacial tunnel valley.
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