Lake Rømsjøen is a clear-water lake in the wilderness area of Rømskog Municipality.
It’s been said that Rømskog is the pearl of Østfold, not least for the lovely nature round Lake Rømsjøen. The largest lake the municipality it’s generally deep, but shallow near the shore. The greatest depth is 100 m. With its many coves and islands it offers many possibilities for a varied fishing experience. The water is comparably sour water with a lot of humus.