Note 262 — BOOK VI. AN ACCOUNT OF COUNTRIES, NATIONS, SEAS, TOWNS, HAVENS, MOUNTAINS, RIVERS, DISTANCES, AND PEOPLES WHO NOW EXIST, OR FORMERLY EXISTED.
John Bostock translation
This district occupied the southern part of modern Khiva, the south-western part of Bokhara, and the north-eastern part of Khorassan. This province of the ancient Persian empire received its name from the river Margus, now the Moorghab. It first became known to the Greeks by the expeditions of Alexander and Antiochus I.