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).

The old part of Sønderborg is located on the island of Als, but some of its western suburbs have spread onto the mainland of Jutland into what had been the interior of the fort of Dybbøl.

Sønderborg is an economic hub in the region of Southern Denmark, with industries within electronics, manufacturing, food processing, Information Technology and telecommunications among others, with several companies headquartered in and around the town.

[6] Linak, headquartered in Nordborg 25 km from Sønderborg, produces linear actuators for a variety of different applications, from agriculture to healthcare, and employs around 1,100 people in the region.

Molslinjen operates daily ferry services from Fynshav to Bøjden on the island of Funen, with roads connecting the town to Odense and further to Zealand and Copenhagen.

The formerly ruling family of Schleswig-Holstein-Sonderburg married into Kings and Queens Sønderborg is home to the South Jutland Symphony Orchestra Sønderjyllands Symfoniorkester.

Crossing the bridge I climbed the Dybbol – dotted with memorials of that heroic defence – and thence could see the wee form and gossamer rigging of our yacht on the silver ribbon of the Sound.

(...) In the old quarter I bargained over eggs and bread with a dear old lady, pink as a debutante, who made a patriotic pretence of not understanding German."