Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. South Khorasan is a province located in eastern Iran. Birjand is the centre of the province. The other major cities are Ferdows and Qaen. South Khorasan Province consists of 7 counties: Birjand, Boshruyeh , Ferdows , Qaen , Sarayan , Nehbandan , Darmian and Sarbisheh. South Khorasan is one the three provinces that were created after the division of Khorasan in 2004. Greater Khorasan has witnessed the rise and fall of many dynasties and governments in its territory throughout history. Various tribes of the Arabs, Turks, Mongols, Turkemen and Afghans brought changes to the region time and time again. Ancient geographers of Iran divided Iran into eight segments of which the most flourishing and largest was the territory of Greater Khorasan. The famous Parthian empire was based near Merv in Khorasan for many years.