Tübingen is one of the four Administrative Regions (Regierungsbezirke) of Baden-Württemberg, Germany, located in the south-east of the country. It covers most of the German shore of Lake Constance (Bodensee), and also the beginning of the Danube River valley. It is sub-divided into the three regions (Regionalverband): Neckar-Alb, Donau-Iller and Bodensee-Oberschwaben.