The Upper Satrapies comprised the entire eastern half of the territories conquered by Alexander: typically everything east of the River Tigris, from the Zagros Mountains in the west to the borders of India in the southeast and Central Asia in the northeast, including the provinces of Media, Persis, Karmania, Drangiane, Hyrkania, Parthia, Margiane, Aria, Baktria, and Sogdiane. The area initially also included the easternmost conquests of Alexander in India and modern-day Afghanistan and Pakistan (the Paropamisadai, Arachosia, and Gedrosia), but these were definitely lost to Chandragupta Maurya in 303 BC, after his treaty with Seleucus I Nicator.