Water and land alternate in the National Park Weerribben-Wieden. This creates habitats for all kinds of animals and plants, such as the large fire butterfly, the black tern, the otter, and - among the plants - the marsh spurge, the heartleaf, or the marsh glossy weed.[2] The Weerribben and Wieden owe their status as a national park to the enormous biodiversity of the area. There you can find lakes, ditches and canals, willows, reeds, as well as swamp forests. Each of these landscape types is valuable because it favors the occurrence of specific plants and animals.