South Khorasan Province is a province located in eastern Iran. Birjand is the centre of the province. The other major cities are Ferdows, Tabas and Qaen. In 2014, it was placed in Region 5. This new province, is but the old Quhistan which was included into greater Khorasan in the Iranian administrative planning. However, historically Qohistan forms a separate entity, with a distinct culture, history, environment and ecology.