Res gestae 23.6: Describuntur maiores privinciae xviii regni Persarum, una cum suis quaeque viribus, moresque nationum.

After passing the strait which has been mentioned, one comes to the bay of Carmania facing the east. Then, a long distance to the south, the bay of Canthicus opens, and not far off is another, called Chalites, facing the setting sun. Next, after one has skirted many islands, few of which are well known, those bays unite with the Indian ocean, which is first of all to receive the glowing sun when it rises, and is itself also exceedingly warm.

And as the pens of geographers have drawn it, the whole circuit just described has this form. In the northern direction, to the Caspian Gates it borders on the Cadusii, on many tribes of the Scythians, and on the Arimaspse, wild, one-eyed men. On the west it touches Armenia, Niphates, the Asiatic Albani, the Red Sea, and the Scenitic Arabs, whom men of later times called the Saracens. Under the southern heaven it looks down on Mesopotamia. Opposite the eastern front it extends to the Ganges river, which cuts through India and empties into the southern ocean.

Now there are in all Persia these greater provinces, ruled by vitaxae, or commanders of cavalry, by kings, and by satraps-for to enumerate the great number of smaller districts would be difficult and superfluous-namely, Assyria, Susiana, Media, Persis, Parthia, Greater Carmania, Hyrcania, Margiana, the Bactriani, the Sogdiani, the Sacae, Scythia at the foot of Imaus, and beyond the same mountain, Serica, Aria, the Paropanisadae, Drangiana, Arachosia, and Gedrosia.

When Zoroaster had boldly made his way into the unknown regions of Upper India, he reached a wooded wilderness, whose calm silence the lofty intellects of the Brahmins control. From their teaching he learned as much as he could grasp of the laws regulating the movements of the earth and the stars, and of the pure sacrificial rites. Of what he had learned he communicated something to the understanding of the Magi, which they, along with the art of divining the future, hand on from generation to generation to later times.

Beyond these lands of both Scythias, towards the east, the summits of lofty walls form a circle and enclose the Seres, remarkable for the richness and extent of their country. On the west they are bounded by the Scythians, and on the north and the east they extend to a snowclad waste; on the south they reach India and the Ganges. There are mountains there, called Anniba, Nazavicium, Asmira, Emodon, and Opurocorra.

Beyond the Seres live the Ariani, exposed to the blasts of the north wind; through their lands flows a river called the Arias, large enough to carry ships, which forms a great lake called by the same name. Moreover, this same Aria has many cities, among which the following are renowned: Vitaxa Sarmatina, Sotira, Nisibis, and Alexandria, from which the voyage to the Caspian Sea is reckoned as fifteen hundred stadia.

Neighbours to these places are the Paro- panisadae, facing the Indi on the east, and the Caucasus on the west; they themselves also dwell on the slopes of the mountains and through their country (besides some smaller rivers) flows the Gordomaris, rising in Bactria. And they also have some cities, of which the better-known are Agazaca, Naulibus, and Ortospana, from which the distance along the bank of the river to the frontiers of Media next to the Caspian Gates is 2200 stadia.

Joining the aforesaid are the Drangiani, connected with them by hills. Their land is washed by the river Arabius, so-called from the place of its rise. Among other towns they are proud of two, Prophthasia and Ariaspe, because of their wealth and fame.

Then, opposite to these, we see Arachosia, on the right facing the Indi. From a much smaller river, flowing out from the mighty Indus, from which the whole region takes its name, Arachosia receives an abundance of water; this river forms a lake, called Arachotoscrene. Here also among insignificant cities, are Alexandria, Arbaca, and Choaspa.

Now far within Persia lies Gedrosia, on the right reaching the frontiers of the Indi; it is made fertile by the Artabius, in addition to smaller streams. Here the Arbitani mountains come to an end, and from their bases flow other rivers, which mingle with the Indus, losing their names through the size of the greater stream. But here, too, there are famous cities, in addition to islands; but Ratira and Gynaecon limen are more highly esteemed than the rest.

It remains for me to speak briefly about the origin of this gem. Among the Indians and the Persians pearls are found in strong, white sea-shells, being conceived at a definite time of the year by mixture with dew. For at that time they desire, as it were, a kind of copulation, and by often opening and shutting quickly they take in moisture by sprinkling with moonlight. Thereby becoming pregnant, they each bear two or three small pearls, or else uniones, so called because the shell-fish, when opened, sometimes yield only one pearl, but in that case they are of greater size.