What region did France gain from Germany?

France gained the region of Alsace-Lorraine from Germany following World War I as part of the Treaty of Versailles in 1919. This territory had been annexed by Germany after the Franco-Prussian War in 1871. The region has a complex history of shifting control between France and Germany, reflecting deep national sentiments and cultural ties. Alsace-Lorraine was significant for its strategic location and economic resources.