Khorasan (Persian: استان خراسان[xoɾɒːˈsɒːn] (About this soundlisten); 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".[1] The name was first given to the eastern province of Persia during the Sasanian Empire[2] and was used from the late middle ages in distinction to neighbouring Transoxiana.[3][4][5]

This province whose people are mainly Shia Muslims,[6] roughly encompassed the western half of the historical Greater Khorasan.[7] The modern boundaries of the Iranian province of Khorasan were formally defined in the late nineteenth century[2] and the province was divided into three separate administrative divisions in 2004.[8]