Flensburg (Danish and Low Saxon: Flensborg, Frisian: Flensburch, North Frisian: Flansborj) is a city in Germany. It is next to the border with Denmark. About 90,164 people live in Flensburg. The city has a university. A very well known part of Flensburg is Mürwik. There lies a small navy harbour. Flensburg lives on tourism, students and the German navy forces.