Geographiae informatio

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.