It is located on the northern bank of the Eider river, approximately eight kilometers away from its mouth at the North Sea. Tönning has a population of some 5,000 people.
Transport
Tönning is connected by a regional train with Sankt Peter-Ording to the West, and Husum to the North-East. Tönning is also served by several bus routes.
Friedrich Wilhelm Selck (1821–1911), councilor of commerce, honorary citizen since 1899
Friedrich von Esmarch (1823–1908), German physician and the founder of the civilian Samaritan system in Germany, honorary citizen since 1897; there is a memorial statue dedicated to him in the castle park.