Parasang

1814 map of Persia during the Qajar dynasty, with scale bars in the bottom left corner for both British Statute Miles and "Persian Farsangs or Parasangs"

The parasang, also known as a farsakh (from Arabic), is a historical Iranian unit of walking distance, the length of which varied according to terrain and speed of travel. The European equivalent is the league. In modern terms the distance is about 3 or 3½ miles (4.8 or 5.6 km).