Alexander proceeded as far southward as Memphis and the Pyramids, and then embarking on the western or Kanopic branch of the Nile, sailed down to Lake Mareôtis, and landed on the narrow sandy isthmus by which that lake is separated from the sea. This neck of land was faced on the north by the island of Pharos, a long ridge of rock which sheltered it from all the violence of the ocean. Alexander, discerning with his keen eye all the advantages of such a position for commerce, at once founded on the isthmus the city of Alexandria, which, as he anticipated, soon became the great centre of trade between the eastern and western worlds. His next object was to consult the oracle of Jupiter Ammon, which was said to have been visited by Heraklês and Perseus, from both of whom he claimed to be descended. He therefore marched along the coast for about 200 miles to Paraitonion, which lay at the western extremity of Egypt. On the way he was met by deputies from Kyrênê, who brought him valuable presents, and invited him to visit their city. From Paraitonion he marched southward through the Libyan desert, and, after some days, reached the large and beautiful oasis where, embosomed amid thick woods, rose the temple of Ammon and the palace of his priests. On consulting the oracle he obtained answers, about the nature of which he stated nothing further than that they were satisfactory. He then returned across the desert to Memphis, where he settled the future government of Egypt, and ordered justice to be dispensed according to the ancient laws of the country. From Memphis he directed his march to Syria, and on reaching Tyre, remained there for some time. While he was in Egypt he had been visited by Hegelochos, his admiral, who reported that the Persians had been dispossessed of the islands which they had acquired in the Aegean; that their fleet had been dissipated, and that all their leaders were prisoners except Pharnabazos, the successor of Memnon, who had died somewhat suddenly while Alexander was in Phrygia.