Osnabrück (German pronunciation: [ɔsnaˈbʁʏk]) is a city in Lower Saxony, Germany, some 80 km NNE of Dortmund, 45 km NE of Münster, and some 100 km due west of Hanover. It lies in a valley penned between the Wiehen Hills and the northern tip of the Teutoburg Forest. As of June 30, 2006, its population was 163,357, making it the third-largest city in Lower Saxony.