37 deg.

50'.

The waters of the Aji-Su are, unfortunately, salt, and it is therefore valueless for purposes of irrigation.
The Zenderud or river of Isfahan rises from the eastern flank of the Kuh-i-Zerd (Yellow Mountain), a portion of the Bakhti-yari chain, and, receiving a number of tributaries from the same mountain district, flows with a course which is generally east or somewhat north of east, past the great city of Isfahan--so long the capital of Persia--into the desert country beyond, where it is absorbed in irrigation.

Its entire course is perhaps not more than 120 or 130 miles; but running chiefly through a plain region, and being naturally a stream of large size, it is among the most valuable of the Median rivers, its waters being capable of spreading fertility, by means of a proper arrangement of canals, over a vast extent of country, and giving to this part of Iran a sylvan character, scarcely found elsewhere on the plateau.
It will be observed that of these streams there is not one which reaches the ocean.

All the rivers of the great Iranic plateau terminate in lakes or inland seas, or else lose themselves in the desert.