Aabenraa is a town in Southern Denmark, at the head of the Aabenraa Fjord, an arm of the Little Belt, 26 kilometres north of the Denmark–Germany border and 32 kilometres north of German town of Flensburg. It was the seat of Sønderjyllands Amt until 1 January 2007, when the Region of Southern Denmark was created as part of the 2007 Danish Municipal Reform. With a population of 16,401, Aabenraa is the largest town and the seat of the Aabenraa Municipality.