Ełk Lake with the town of Ełk in the background
|Location||Masurian Lake District|
The lake that was created by glacial action during the Pleistocene ice age and has a surface area is 3.82 square kilometres. Its average depth is 15m with 58.2m as a maximum. It is divided into two distinct parts, the northern ("small") and southern ("large"), by a narrows spanned by a bridge. Primarily fed by the Ełk River from the south west the lake discharges into Lake Sunowo at the north-west, and Lake Szarek at the south west.