Teltow (German pronunciation: [ˈtɛltoː] ) is both a geological plateau and also a historical region in the German states of Brandenburg and Berlin. As an historical region, the Teltow was one of the eight territories out of which the March of Brandenburg was formed in the 12th and 13th centuries. As a result of the Teltow War (1239–1245) the question of territorial lordship of the newly created heart of the expanding march was finally decided here. Between 1835 and 1952 there was also a county, Teltow district ; in addition a town immediately south of Berlin, in the present-day county of Potsdam-Mittelmark, bears the name Teltow.