The rivers, too, were capable of furnishing fresh-water fish in good quantity, though we cannot say if this source of supply was utilized in antiquity.
The mineral treasures of Persia were fairly numerous.

Good salt was yielded by the lakes of the middle region, and was also obtainable upon the plateau.

Bitumen and naphtha were produced by sources in the low country.

The mountains contained most of the important metals and a certain number of valuable gems.

The pearls of the Gulf acquired early a great reputation, and a regular fishery was established for them before the time of Alexander.
But the most celebrated of all the products of Persia were its men.