Elgåfossen Østfold's highest unregulated waterfall with a drop of 46 meters. The farthest south in Østfold, near Holtet in Enningdalen. The border with Sweden is in the middle of the waterfall. It is therefore Bohuslän highest unregulated waterfall. Elgåfossen, which is part of the river Elja (Elgå), flows into Enningdal.