The nature park lies mainly in Lüchow-Dannenberg and, after being extended in 2006, covers the majority of this rural district.
The park originally included two very different geographical regions from which it derived its name: Both landscapes were formed by the ice age.
On 1 June 2006 the protected area of the nature park was increased to 115.994 hectares (286.63 acres), almost double its previous size.
The banks of the Elbe are under special protection as breeding, stopover and winter sites on the bird migration routes between Siberia and Africa.
During the summer months more than 150 species of bird breed here and white and black storks, cranes, herons and white-tailed eagles can be seen.