The Danish parts of the Wadden Sea, has been protected nature since 2010, when it became a national park. The Wadden Sea National Park is by far the largest of Denmark's national parks, outside of Greenland, reaching from Ho Bugt in the north, right to the German border, and includes the islands of Fanø, Mandø and Rømø, as well as Skallingen, the Varde Å valley, and many of the marshlands of Tjæreborgmarsken, Ribemarsken, Margrethekogen and De Ydre Diger in Tøndermarsken.

97% of the national park is part of the European Natura 2000 nature protection, divided into several projects: a bird sanctuary, a wildlife sanctuary, and Ramsar wetlands of international importance. The areas comprise biomes like the low-lying flat coast, tidal channels, tidal flats, stream mouths, beach meadows, sandplains and dunes.

More than 10 million migratory birds pass through the Danish parts of the Wadden Sea twice a year, signifying the area's international importance. Large flocks of European starlings can be experienced flying in peculiar huge group-formations known as 'black sun formation', a truly special natural phenomenon. The Wadden Sea is also home to large numbers of breeding birds, fish, and invertebrates such as starfish and blue mussels, and it provides habitat for more than 500 species of plants and animals.