8. Its left shore is looked down upon by Port Athyras and Selymbria, and Constantinople, formerly called Byzantium, a colony of the Athenians, and Cape Ceras, having at its extremity a lofty tower to serve as a lighthouse to ships--from which cape also a very cold wind which often arises from that point is called Ceratas. 9. The sea thus broken, and terminated by mingling with the seas at each end, and now becoming very calm, spreads out into wider waters, as far as the eye can reach both in length and breadth. Its entire circuit, if one should measure it as one would measure an island, sailing along its shores, is 23,000 furlongs according to Eratosthenes, Hecatæus, and Ptolemy, and other accurate investigators of subjects of this kind, resembling, by the consent of all geographers, a Scythian bow, held at both ends by its string. 10. When the sun rises from the eastern ocean, it is shut in by the marshes of the Sea of Azov. On the west it is bounded by the Roman provinces. On the north lie many tribes differing in language and manners; its southern side describes a gentle curve. 11. Over this extended space are dispersed many Greek cities, which have for the most part been founded by the people of Miletus, an Athenian colony, long since established in Asia among the other Ionians by Nileus, the son of the famous Codrus, who is said to have devoted himself to his country in the Doric war. 12. The thin extremities of the bow at each end are commanded by the two Bospori, the Thracian and Cimmerian, placed opposite to one another; and they are called Bospori because through them the daughter of Inachus,[124] who was changed (as the poets relate) into a cow, passed into the Ionian sea. 13. The right curve of the Thracian Bosphorus is covered by a side of Bithynia, formerly called Mygdonia, of which province Thynia and Mariandena are districts; as also is Bebrycia, the inhabitants of which were delivered from the cruelty of Amycus by the valour of Pollux; and also the remote spot in which the soothsayer Phineus was terrified by the threatening flight of the Harpies. 14. The shores are curved into several long bays, into which fall the rivers Sangarius, and Phyllis, and Bizes, and Rebas; and opposite to them at the lower end are the Symplegades, two rocks which rise into abrupt peaks, and which in former times were accustomed to dash against one another with a fearful crash, and then rebounding with a sharp spring, to recoil once more against the object already struck. Even a bird could by no speed of its wings pass between these rocks as they pass and meet again without being crushed to death.