In 1806 Napoleon elevated the remaining states of Anhalt-Bernburg, Anhalt-Dessau, and Anhalt-Köthen to duchies. (Anhalt-Plötzkau and Anhalt-Zerbst had in the meantime ceased to exist.) These duchies were united in 1863 to form a single Duchy of Anhalt, again due to the extinction of the Köthen and Bernburg lines. The new duchy consisted of two large portions: Eastern and Western Anhalt, separated by the interposition of a part of the Prussian Province of Saxony, and five exclaves surrounded by Prussian territory, namely Alsleben, Muhlingen, Dornburg, Goednitz and Tilkerode-Abberode. The eastern and larger portion of the duchy was enclosed by the Prussian government district of Potsdam (in the Prussian province of Brandenburg), and Magdeburg and Merseburg (belonging to the Prussian province of Saxony). The smaller western part (the so-called Upper Duchy or Ballenstedt) was also enclosed by the two latter districts as well as by the duchy of Brunswick-Lüneburg.