Note 2856 — BOOK IV. AN ACCOUNT OF COUNTRIES, NATIONS, SEAS, TOWNS, HAVENS, MOUNTAINS, RIVERS, DISTANCES, AND PEOPLES WHO NOW EXIST OR FORMERLY EXISTED.
John Bostock translation
Probably meaning the Straits or passage connecting the Lake Mæotis with the Euxine. The fertile district of the Cimmerian Bosporus was at one time the granary of Greece, especially Athens, which imported thence annually 400,000 medimni of corn.