تعیین موقعیت جغرافیای باستان

When Darius, on his march from Susa, reached the territory of Chalcedon on the shores of the Bosphorus, where the bridge had been made, he took ship and sailed thence to the Cyanean islands which, according to the Greeks, once floated. He took his seat also
in the temple and surveyed the Pontus, which is indeed well worthy of consideration. There is not in the world any other sea so wonderful: it extends in length eleven ousand one hundred furlongs, and its breadth, at the widest part, is three thousand three hundred. The mouth is but four furlongs wide; and this strait, called the Bosphorus, and across which the bridge of Darius had been thrown, is a hundred and twenty furlongs in length, reaching from the Euxine to the Propontis. The Propontis is five hundred furlongs
across, and fourteen hundred long. Its waters flow into the Hellespont, the length of which is four hundred furlongs, and the width no more than seven. The Hellespont opens into the wide sea called the Egean
(Herodotus/book4/chapter85)