Bactria or Bactriana was the name of a historical region in Central Asia. Bactria proper was north of the Hindu Kush mountain range and south of the Amu Darya river, covering the flat region that straddles modern-day Afghanistan, Tajikistan, and Uzbekistan. More broadly Bactria was the area north of the Hindu Kush, west of the Pamirs and south of the Tian Shan with the Amu Darya flowing west through the center.