Ełk Lake is a fresh water lake in the Masurian Lake District of Poland's Warmia-Mazury Province adjacent to the town of Ełk.
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 and southern, 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.
Address 19-300, Poland
Coordinates 53°48'34.308" N 22°20'29.124" E