Kvadraturen is the city center of Kristiansand in Vest-Agder county, Norway. The borough is made up of the very urban city centre and harbour in the south plus the more rural district of "Eg" which lies north of the main city centre. In 2015 the borough had a population of 6,750. This borough is the administrative centre of the municipality of Kristiansand as well as the administrative centre of Vest-Agder county. The borough is far smaller in area than the other boroughs in the municipality. The borough of Grim lies to the north and west and the borough of Lund lies to the east.
The borough is the location of the Kristiansand Cathedral and the nearby commercial, pedestrian street is the Markens gate. The city harbour is located along the Kristiansandsfjorden and the island of Odderøya. The borough has three malls and three high schools. The closest public junior high is "Grim Skole" and the closest elementary is Tordenskjoldsgate Skole and is the only remanding elementary in Kvadraturen. The Sørlandet Hospital Kristiansand is also located in the borough, in the district of Eg.
The main city centre was established as a city on 5 July 1641 by King Christian IV. The city became a self-governing municipality under the formannskapsdistrikt law on 1 January 1838. On 1 July 1921, a neighboring part of the municipality of Oddernes (population: 2,164) was transferred from Oddernes to the city of Kristiansand. During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1965, the city of Kristiansand (population: 27,100) was merged with the neighboring municipalities of Randesund (population: 1,672), Oddernes (population: 18,668), and Tveit (population: 2,802) to form a new, larger municipality of Kristiansand.
Kristiansand Bus Terminal, Kristiansand Station, and Kristiansand Harbor are all located at Vestre Strandgate next to each other. Local buses goes from Henrik Wergelandsgate and Tollbodgata.
Kristiansand Station has daily trains to Oslo and Stavanger. Kristiansand Harbor has many daily ferry routes to Hirtshals, Denmark.
Kristiansand Airport, Kjevik is located 16 kilometres (9.9 mi) from the city center, and it has routes to the biggest cities in Norway, with less frequent routes to other Northern European cities.
The borough of Kvadraturen is the site of many tourist attractions. Christiansholm Fortress was built in 1672. The Kilden Theatre, the largest culture house and theatre in Southern Norway, is located on the island of Odderøya. It was finished in 2012 and has a capacity of over 2,000.
Fiskebrygga (The Fish Wharf), a former fish landing in Kvadraturen with Odderøya, has been redeveloped as a restaurant, shopping, and tourist destination.