Thus we have in the northern hemisphere the Sahara desert, the deserts of Arabia, Iran, Turan, Takla Makan and Gobi, and the desert regions of the Great Basin in North America; and in the southern hemisphere the Kalahari desert in Africa, the desert of Australia, and the desert of Atacama in South America.
The only historical fact which we can learn from the Iranian tradition is that the contrast and the feud between the peasants of Iran and the nomads of Turan was as great in old times as it is now: it is indeed based upon the natural geographical conditions, and is therefore eternal.
The Oxus figures in Persian romantic history as the limit between Iran and Turan, but the substratum of settled population to the north as well as the south was probably of Iranian lineage.
The great steppe which stretches north of the Black Sea and the Caspian., through South Russia, to Turan (Turkestan) and the Oxus and Jaxartes.
Though found neither in the inscriptions of Darius nor in the Greek authors, the name Turan must nevertheless be of great antiquity; for not merely is it repeatedly found in the Avesta, under the form Tura, but it occurs already in a hymn, which, without doubt, originates from Zoroaster himself, and in which the Turanian Fryana and his descendants are commemorated as faithful adherents of the prophet (Yasna, 46, 62).