At the time of Strabo, the geography of the ancients did not extend, on the eastern coast of Africa, further to the south than a promontory called Noti Cornu, (the Southern Horn,) which seems to have been in about 12-1/2 degrees north latitude. Beyond this an arid coast, without ports or fresh water, arrested the progress of navigation; but it appears by the Periplus, that this promontory was now passed, and commerce had extended to the port of Rhapta and the isle of Menutias, which are supposed to correspond with Babel Velho and the island of Magadoxa. The author of the Periplus, who seems to have been a merchant personally acquainted with most of the places he describes, had heard of, but not visited the promontory Prasum: he represents the ocean beyond Rhapta as entirely unknown, but as believed to continue its western direction, and after having washed the south coast of Ethiopia, to join the Western Ocean. The whole of the west coast of India, from the Indus to Trapobane, is minutely described in the Periplus. Some of the particulars of the manners and customs of the inhabitants coincide in a striking manner with those of the present day; this observation applies, among other points, to the pirates between Bombay and Goa. Dr. Vincent, in his learned commentary on the Periplus, gives it as his opinion, that the author of the Periplus never went further than Nelkundah himself, that is, to the boundary between the provinces of Canara and Malabar. The east coast of the Indian peninsula is not traced so minutely nor so accurately as the west coast, though there are names and descriptions in the Periplus, from which it may fairly be inferred, that the author alludes to Cavary, Masulapatam, Calingapatam, Coromandel, and other places and districts of this part of India. The countries beyond the Ganges, the Golden Chersonese, and the countries towards China, are very obscurely noticed in the Periplus, though the information he gives respecting the trade carried on in these parts is much more minute and accurate. His description of the direction of the coast of India, is on the whole, surprisingly consonant to truth: according to him, it tends from north to south, as far as Colchos (Travancore); at this place it bends to the east, and afterwards to the north; and then again a little to the east, as far as the Ganges. He is the first author in whom can clearly be traced the name of the great southern division of India: his term is Dachanabades,--Dachan signifying south, and abad a city; and Decan is still the general name of all the country to the south of Baroche, the boundary assigned by the author. The particulars he mentions of the bay of Cutch, of Cambay, of Baroche, and of the Ghauts, may also be mentioned as proofs of his accuracy with respect to those parts of India, which he visited in person.