The Christian Syriac legend describes a flat Earth orbited by the sun and surrounded by the Paropamisadae (Hindu Kush) mountains. The Paropamisadae mountains are in turn surrounded by a narrow tract of land which is followed by a treacherous Ocean sea called Okeyanos. It is within this tract of land between the Paropamisadae mountains and Okeyanos that Alexander encloses Gog and Magog, so that they could not cross the mountains and invade the Earth. The legend describes "the old wise men" explaining this geography and cosmology of the Earth to Alexander, and then Alexander setting out to enclose Gog and Magog behind a mighty gate between a narrow passage at the end of the flat Earth: