Augustenborg (German: Augustenburg) is a town on Als Island in Sønderborg Municipality, Region of Southern Denmark in Denmark. The town lies at the head of Als Fjord. To the east is the Little Belt. Ferry service connects Augustenborg to the island of Funen from the nearby town of Fynshav.
The town grew up around Augustenborg Palace which was established by Ernest Günther, a member of the ducal house of Schleswig-Holstein (its branch of Sønderborg) and a cadet of the royal house of Denmark, in the years after 1651. The palace, and the town consequently, received the name in honor of Ernest's wife Auguste, herself also from a branch of dukes of Schleswig-Holstein.
The palace became the chief seat of their line which used the name Augustenborg as its branch name. Later, a Danish king made the head of that line specifically Duke of Augustenborg. They grew in relative prominence in late 18th century, and in the 19th century Schleswig-Holstein Question, being the symbols of pro-German nationalistic movement in Schleswig-Holstein. The area was annexed by Prussia in 1864 from Denmark, but was returned in 1920 following a plebiscite.
- Municipal statistics: NetBorger Kommunefakta
- Municipal mergers and neighbors: Eniro new municipalities map
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- Sønderborg municipality's official website (in Danish)