Even Hecataeus of Miletus (549-472 B.C.), the author of a Periodos or description of the earth, of whom Herodotus borrowed the terse saying that Egypt was the gift of the Nile, retained this circular shape and circumfluent ocean when producing his map of the world, although he had at his disposal the results of the voyage of Scylax of Caryanda from the Indus to the Red Sea, of Darius' campaign in Scythia (513), the information to be gathered among the merchants from all parts of the world who frequented an emporium like Miletus, and what he had learned in the course of his own extensive travels.
In compiling his map he was able to avail himself of the information obtained by the bematists (surveyors who determined distances by pacing) who accompanied Alexander the Great on his campaigns; of the results of the voyage of Nearchus from the Indus to the Euphrates, and of the " Periplus " of Scylax of Caryanda, which described the coast from between India and the head of the Arabian Gulf.
SCYLAX OF CARYANDA (in Caria), Greek historian, lived in the time of Darius Hystaspis (521-485 B.C.), who commissioned him to explore the course of the Indus.
He had the course of the Indus explored by the Carfan captain Scylax (q.v.) of Caryanda, who then navigated the Indian Ocean back to Suez (Herod.