[2] The Wadden Sea National Park is by far the largest of Denmark's national parks outside of Greenland and covers the Danish part of the Wadden Sea from Ho Bugt 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.

Large flocks of European starlings can be found which fly in formations known as the sort sol.

The Wadden Sea also has large numbers of breeding birds, fish, and invertebrates such as starfish and blue mussels.

Because of its unique biodiversity and intact intertidal ecosystem, since 2014 it has constituted the Danish part of the Wadden Sea World Heritage Site.

The official motivation behind Wadden Sea National Park (Denmark) was to strengthen:[2]