Khorasan (Persian: استان خراسان [xoɾɒːˈsɒːn] (listen); also transcribed as Khurasan and Khorassan), also called Traxiane during Hellenistic and Parthian times, is a province in northeastern Iran but historically referred to a much larger area, comprising the east and the northeast of the Persian Empire. The name Khorāsān is Persian and means "where the sun arrives from". The name was first given to the eastern province of Persia during the Sasanian Empire and was used from the late middle ages in distinction to neighbouring Transoxiana.
This province whose people are mainly Shia Muslims, roughly encompassed the western half of the historical Greater Khorasan. The modern boundaries of the Iranian province of Khorasan were formally defined in the late nineteenth century and the province was divided into three separate administrative divisions in 2004.