The Great Syrtis is 5000 stades, the Little Syrtis 1600 stades. The mouth of the Adriatic, which some call the Ionian Sea, has a passage of 700 stades from the tip of Iapygia to the Ceraunian mountains in Epirus.

After the Aegean Sea comes the Hellespont ending at Abydus and Sestus, then the Propontis ending at Chalcedon and Byzantium, where the narrows are from which the Pontus begins, then Lake Maeotis. Again, from the beginning of Europe and Libya the Iberian Sea from the Pillars to Mt Pyrene, the Ligurian as far as the borders of Etruria, the Sardinian beyond Sardinia bending down towards Libya, the Tuscan ending as far as Sicily and beginning from the capes of Liguria, then the Libyan, then the Cretan and Sicilian and Ionian and Adriatic and the one opening out of the Sicilian sea, which they call the gulf of Corinth or Halcyon sea. The Saronic sea enclosed by Sunium and Scyllaeum, then the Myrtoan and Icarian, in which are the Cyclades, then the Carpathian and Pamphylian and Egyptian. Beyond the Icarian spreads the Aegean.

The coast of Europe from the outlet of the Tanais River to the Pillars of Hercules is 69709 stades, of Libya from Tingis to the Canobic mouth is 29252 stades, of Asia from Canobus to the Tanais River, with the gulfs, is 40111 stades; altogether, the coast of our earth, with the gulfs, is 139072 stades, including Lake Maeotis, of which the perimeter is 9000 stades and the mouth at the Cimmerian Bosporus is 2070 stades.

The Pontus is 3350 stades, the narrows at the Thracian Bosporus, where Dareius built the bridge against the Scythians, is six stades.

The Persian Sea, being round and narrowing to the mouth at the capes of Carmania and Arabia, has a perimeter of 20000 stades; the mouth, between Arabia and Carmania is 400 stades.

The Hyrcanian or Caspian Sea, being crescent-shaped, but some say oblong, is 20000 stades and has a passage of 1000 stades at the mouth.

The Arabian Gulf, being narrow and oblong, begins from the gulf of Heroöpolis along Troglodytica to Ptolemais at the Hunts 9000 stades long, where follows a voyage of 6500 stades, the narrows at Deire of 60 stades, along the Red Sea to the ocean 5000 stades, the rest is not navigated. The side along Arabia from the gulf of Aelana is 14000 stades. Arabia itself extends to the Red Sea and lengthens to 12000 stades.