Øyeren

Øyeren is a lake in the Glomma River watershed, southeast of Lillestrøm. It is located within the municipalities of Enebakk, Skedsmo, Fet, and Rælingen in Akershus county and Spydeberg and Trøgstad municipalities in Østfold county.

Lake Øyeren is the ninth largest lake by area in Norway with a surface area of 84.7 square kilometers (32.7 square miles). It is 101 meters (331 feet) above sea level and 71 meters (233 feet) deep.

The name of the lake (Norse Øyir) is derived from øy f ‘island; flat and fertile land along a waterside’.

An area that includes parts of the northern (“nordre”) end of the lake is an established nature preserve, listed as a Ramsar site.