|Region||Southern Denmark (Syddanmark)|
|• Mayor||Eric Lauritzen|
|Area(in Sønderborg Municipality)|
|• City||496.57 km2 (191.73 sq mi)|
|Elevation||17 m (56 ft)|
|• Density||55/km2 (140/sq mi)|
|Time zone||UTC+1 (Central Europe Time)|
|• Summer (DST)||UTC+2|
|Area code(s)||(+45) 88|
Sønderborg (Danish pronunciation: [ˈsønɐˌbɒːˀ] - (German: Sonderburg (help·info)) is a Danish town in the Region of Southern Denmark. It is the main town and the administrative seat of Sønderborg Municipality (Kommune). The town has a population of 27,434 (1 January 2014), in a municipality of 75,264.
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The town of Sønderborg is home to Sønderborg Castle (Sønderborg Slot), the Royal Danish Army's Sergeant School (until 2013) and Sandbjerg Estate (Sandbjerg Gods). Sønderborg castle is in the centre of the town, and houses a museum focusing on the history and culture of the area. The museum is open all year. 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. In addition Sønderborg has a castle-like barracks built by the German military in 1906, placed centrally by Als Fjord, opposite Alsion (see picture below).
Prior to the Second Schleswig War of 1864, Sønderborg was situated in the Duchy of Schleswig, a Danish fief, so its history is properly included in the contentious history of Schleswig-Holstein. In the 1920 Schleswig Plebiscite returned Northern Schleswig to Denmark, 43.8% of the city of Sønderborg's inhabitants voted for the cession to Denmark and 56.2% voted for remaining part of Germany.
The town of Sønderborg lies on both sides of Alssund; the narrow strait between these two sides is called Als Strait (Alssund). Two road bridges connect the city across the strait: the 682-meter-long (2,238 ft) Als Strait Bridge (Alssundbro), built in 1978-1981; and the 331-meter (1,086 ft) King Christian X's Bridge (Kong Christian Xs Bro), built in 1925-1930.
The city is served by Sønderborg Airport.
Arts & Science
- Christian August Lorentzen (1749–1828) a Danish painter and instructor of Martinus Rørbye
- Joachim Otto Voigt (1798 in Nordborg – 1843) a Danish/German botanist and surgeon specializing in pteridophytes
- Richard Parkinson (1844 in Augustenburg – 1909) a Danish explorer and anthropologist
- Herman Bang (1857 in Asserballe – 1912) a Danish author, one of the men of the Modern Breakthrough
- Jens Jensen (1860 in Dybbøl - 1951) was a Danish-American landscape architect
- Otto Gelert (1862 in Nybøl – 1899) a Danish pharmacist and botanist, specialized in plant floristics and systematics
- Jakob Nielsen (1890 in Mjels – 1959) a Danish mathematician, worked on automorphisms of surfaces
- Christian Gerthsen (1894 in Hörup - 1956) was a Danish-German physicist, contributed to atomic and nuclear physics
- Johannes Iversen (1904–1972) a Danish palaeoecologist
- K.R.H. Sonderborg (1923–2008) a contemporary new media artist and musician.
- Johannes Carstensen (1924—2010) one of the neo-impressionistic Odsherred Painters
- Lothar Göttsche (born 1961) a German mathematician, known for his work in algebraic geometry
- Per Nielsen (born 1954) a popular Danish trumpet player
- Søren Solkær (born 1969) a Danish photographer
- Sune Rose Wagner (born 1973) a Danish songwriter, guitarist, and vocalist, playing in the rock group The Raveonettes
- Ludvig Harboe (1709 in Broager – 1783) a Danish theologian and bishop
- Lars Frodesen (1889–1921) a Danish writer and philosopher, heavily inspired by Blaise Pascal
- Else Roesdahl (born 1942) a Danish historian and educator and archaeologist
- Vibeke Vasbo (born 1944 in Als) a Danish writer and women's rights activist
- Lisbeth Bech Poulsen (born 1982) politician,  member of the Danish folketing for Socialistisk Folkeparti
- Westye Egeberg (1770 in Als – 1830) a Danish-Norwegian timber and lumber businessman
- Andreas Hohwü (1803 in Gråsten – 1885) a Danish clockmaker
- Peter Jebsen (1824 in Broager – 1892) a Norwegian businessman, founded Dale of Norway
- Peder Moos (1906–1991) a Danish furniture designer and cabinetmaker
- Jørgen Mads Clausen (born 1948) Chairman of the board of Danfoss
- Ludvig Drescher (1881–1917) a Danish amateur football goalkeeper, won a silver medal at the 1908 Summer Olympics
- Verner Blaudzun (born 1946) a Danish former cyclist, bronze medalist in the men's team time trial at the 1976 Summer Olympics
- Palle Jensen (born 1953) former Danish handball player, in the 1976 and 1980 Summer Olympics
- Anders Hansen (born 1970) a semi-retired Danish professional golfer.
- Lars Christiansen (born 1972) a former Danish team handball player, played 338 games for the Danish national team
- Dennis Lindskjold (born 1977 in Augustenborg) a Danish darts player
- Simon Poulsen (born 1984) a Danish professional footballer, has played 31 games for the Denmark national football team
- Nicki Thiim (born 1989) a professional Danish racecar driver
- Sara Keçeci (born 1994) a Turkish-Danish female handballer playing goalkeeper
Sønderborg Castle is today a museum about the history of Southern Denmark.
Media related to Sønderborg at Wikimedia Commons