Lake Ellenösjön is in southwest Dalsland Province in Färgelanda Municipality. The lake “shares water” with Lake Östersjö in that it lies to the east of Lake Ellenösjön with only Sundsbron and route 172 between them. The Valboå River both empties into and empties Lake Ellensjö. Surrounded by agricultural landscape, the lake is shallow and eutrophic.
Lake Ellenösjö is shallow and eutrophic. Its surrounding land is typically agricultural with farms, pastures and fields leading down to the lake, most specifically in the northern end. The southern shore is more forested. Shallow reed coves are found throughout the lake, whose maximum depth is only 7 metres. This is why a strong wind can easily muddy the water since its bottom is mostly clay. The Ellensjön is best known for its excellent pikeperch.