De Weerribben-Wieden national Park is a national park in the Durch province of Overijssel, community Steenwijkerland. The national park is the largest bog of North Western Europe. It consists of two areas, 'De Weerribben' and 'De Wieden'. The park was founded in 1882, but it includes De Wieden since 2009. It is about 100 km² large.