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Ostwürttemberg (East Württemberg) is a region in eastern Baden-Württemberg, Germany, in the Stuttgart subdivision (Regierungsbezirk). It consists of the districts of Heidenheim and Ostalb. It borders the Stuttgart Region to the west, the Heilbronn-Franken Region to the north, western Middle Franconia (Bavaria) to the east, Bavarian Swabia to the southeast, and the Alb-Danube district to the south.
The area of Ostwürttemberg covers 2139 km², with a population of 446 349 people. The administrative seat is Schwäbisch Gmünd.