Sønderborg deles af Als Sund

Sønderborg city

Photo: Sønderborg Kommune

The largest city of Southern Jutland is situated on both sides of the inlet Als Sund, surrounded by beautiful nature as well as the forest Sønderskoven Als.

With just over 28,000 inhabitants, Sønderborg is not only the main city in Sønderborg Municipality but also the largest city in Southern Jutland.

Sønderborg is amongst three cities in Denmark with a distinguished feature – water parts it in two!
The main part of the city is situated on the island Als and then there is the christen side on Jutland. The two city parts is connected through the bridge King Christian X Bridge and until the built of the Alssundbridge north of the city this was the only way of travelling to and from the city.

Søndreborg is built

The ravaging of the Wends is a recurring problem in the area.In 1169, King Valdemar the Great builds a castle at the southern entrance of the sound Als Sund as protection. The name Sønderborg descends from Søndreborg (Southern Castle) since there already was the castle named Alsborg on the northern part of the island Als, the name of this castle was changed into Nørreborg (Northern Castle) - today known as Nordborg Castle.

There might have been a small fishing village at the sound, but the town itself is built after the castle and is first mentioned in 1256. Today this castle is well known as a part of Museum Southern Jutland and as the castle where King Christian II was imprisoned, exactly – Sønderborg Castle.

Sønderborg town grows larger in the lee of the castle and achieves the status of market town. In 1856 the two parts of the town is connected through the pontoon bridge Frederik VII Bridge and because of the parish church, Sct. Marie Kirke is situated on the island Als grossing the bridge is free of charge on Sundays. Many people uses the free passage and the part of town on the mainland is named, the Christian side. Though using the free passage it is not all of the people from the Christian side who are seated in the church – the inns are also open on Sundays...

Sønderborg Castle, view from Sundgade (1910-20)
© Museum Sønderjyllands MediearkivPhoto: Ukendt
Sønderborg Castle, seen from Sundgade on the mainland side.
Kong Frederik den 7's Bro, ponton bridge in Sønderborg
© Sønderborg Lokalhistoriske ArkivPhoto: Ukendt
King Frederik the VII's Bridge with the church, Sct. Marie Kirke, in the background.

During the war of 1864 the town is under great focus, the battlefield is situated on Dybbøl Banke un the other side of the small sound Als Sund and the German cannons at Gammelmark on Broagerland can reach the part of town surrounding the castle. Denmark loses the war and the Germans rule the area, as a part of Southern Jutland, until the Reunification in 1920.

In 1905, the German Reich decides to transfer a part of their growing fleet of ships to Flensburg and Sønderborg. A marine station is erected in Sønderborg; known today as the former sergeant school and large villas is built in Art Nouveau style.

1864: Perlegade in Sønderborg.
© Landesbibliothek KielPhoto: Friedrich Brandt
Perlegade in Sønderborg after the 2 - 3 April 1864.
Sønderborg Marine Station and warship
© Museum Sønderjyllands MediearkivPhoto: Ukendt
Sønderborg Marine Station, Marine Artillery School, and Barracks.

Your holiday city

Sønderborg is still extending on both sides of the sound Als Sund.

On the mainland, you will find Alsion housing the University of Southern Denmark, the Videnspark Alsion and Erhvervsakademi Sydvest as well as a world class Alsion Concert hall, home base of the sinfonia orchestra Sønderjyllands Symfoniorkester. The sports hall Broager Sparekasse Skansen is home base of the handball team of Southern Jutland SønderjyskE Håndbold.

At the other side of the sound, on the island Als, Frank Gehrys masterplan is influencing the harbour, with the house of culture, Multikulturhuset, providing setting for the German and Danish library as well as the Southern Jutland School of Art. At Alsik Hotel and Spa, you can enjoy a nice hotel stay, good food and lovely wellness treatments, or you can visit the platform Point of View on the 16th floor and enjoy a 360° view of Sønderborg. In the winter of 2023, the nice Sønderborg Harbour Bath was inaugurated, making it possible to take a plunge in the Als Sund all year round. 

Good opportunities for shopping and cultural events characterizes Sønderborg city, but at the same time, you have the nature at your doorstep. Situated at the water, the lovely forest Sønderskoven Als and Dybbøl Banke as well as Kær Vestermark, the many recreational opportunities makes a city holiday in Sønderborg very special.

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