|Area||321 km2 (124 sq mi)|
|Region||South Denmark Region|
|Largest settlement||Sønderborg (pop. 27.194)|
|Population||51,322 (as of 2010)|
|Density||154.5 /km2 (400.2 /sq mi)|
Als lies east of the Jutland peninsula of Denmark at the town of Sønderborg, and north of the German coast at Schleswig. Covering an area of 321 km² (124 sq. miles), the island has a total population of 51,322 as of 1 January 2010. It encompasses the Sønderborg Municipality as per January 1, 2007.
The town of Sønderborg is the capital, and originally was all on the island, but has spread onto the mainland, being split by the waters of Als Strait (Alssund), part of Als Fjord, the strait that separates the island from Jutland, the Danish mainland. It has a good harbour, considerable trade, and the two halves of the city are connected over the fjord by two bridges: the 682 metre long Als Strait Bridge (Alssundbro), built in 1978 to 1981, carries automobile traffic; and the 331 metre long King Christian X's Bridge (Kong Christian Xs Bro), built in 1925 to 1930, originally carried both automobile and railroad traffic though now is purely for road traffic.
The west coast of the island has many bays and coves: Stegsvig, Sandvig, Ketting Nor, Lille Hav, Augstenborg Fjord, Kær Vig, Hørup Hav, and Dyvig. On the east coast along the Little Belt lies the 7 km² Northern Forest (Nørreskov), and Lake Nordborg (Nordborg Sø).
During the Middle Ages the island come under the influence of a number of noblemen, each of which ruled over their portion of the island, and its citizens. King Christian III's son, Duke John, came in possession of the island as a Duchy, and he bought the other noblemen out. The island was again divided into several smaller Duchies later on, but this venture failed eventually.
The town of Augustenborg grew up around Augustenborg Palace which was established in the years after 1651 by Ernst Günther, a member of the ducal House of Schleswig-Holstein (its branch of Sønderborg), great-grandson of King Christian III, and a cadet of the royal house of Denmark. The palace, and the town consequently, received the name in honor of Ernest's wife Auguste, who was also from a branch of the 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 the Duke of Augustenborg became the dominating person on the island.
The Duchy was overtaken by the Danish Crown after the last Duke of Augustenborg to live at the palace, Christian August II, had sided with the Schleswig-Holstein pro-German nationalistic movement against Denmark. He left on March 18, 1848.
That same year during the First War of Schleswig (1848–1851), the Danes directed their main attack against Fieldmarshal Friedrich Graf von Wrangel's Austro-Prussian army from the lighthouse on the peninsula of Kegnæs at the southwest end of Als.
For events in 1864, see Battle of Als.
In 1870 Als was fortified by Prussia.
Under the two wars over which nation would rule the island, and the following period under Prussian and German rule, the island's population was largely Danish. In 1920 Als returned to Danish rule following a referendum.
After 1920 Als has been marked by growing industry, especially after 1945 when Danfoss grew into an international corporation.
The Augustenburg line died out in the 20th century.
The town of Sønderborg is home to Sønderborg Castle (Sønderborg Slot) and Sandbjerg Estate (Sandbjerg Gods). Sønderborg castle is located in the centre of the town, and houses a museum focusing on the history and culture of the area. The museum is open year round. Sandbjerg Estate, which had belonged for many years to the Dukes of Sønderborg, and then to the Reventlow family, was donated to Aarhus University in 1954.
The island's Augustenborg Palace has been converted into a hospital. There is an exhibit about the castle, the town and its ducal history in the building's entryway. The castle church is open to the public in the summertime, and tours are given.
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