The Sir, where it falls into the Sea of Aral, is very shallow, seldom even in the flood season exceeding four feet.

The length of the stream was till recently estimated at more than 1208 miles; but the latest explorations seem to require an enlargement of this estimate by at least 200 or 250 miles.
In rivers of the second class the Persian Empire was so rich that it will be impossible, within the limits prescribed for the present work, to do more than briefly enumerate them.

The principal were, in Asia Minor, the Hermus (Ghiediz Chai), and the Maeander (Mendere) on the west, the Sangarius (Sakka-riyeh), the Halys (Kizil Irmak), and the Iris (Yechil Irmak) on the north, the Cydnus (Tersoos Chai), Sarus (Cilician Syhun), and Pyramus (Cilician Jyhun) on the south; in Armenia and the adjacent regions, the Araxes (Aras), Cyrus (Kur), and Phasis (Eion); on the Iranic plateau, the Sefid-rud, the Zenderud or river of Isfahan, the Etymandrus (Helmend), and the Arius (Heri-rud); in the low country east of the Caspian, the Gurgan and Ettrek, rivers of Hyrcania, the Margus Churghab (or river of Merv), the Delias or river of Balkh, the Ak Su or Bokhara river, and the Kizil Deria, a stream in the Khanat of Kokand; in Afghanistan and India, the Kabul river, the Hydaspes (Jelum), the Aoesines (Chenab), the Hydraotes (Ravee), and the Hyphasis (Sutlej or Gharra); in Persia Proper, the Oroatis (Hindyan or Tab), and the Bendamir; in Susiana, the Pasitigris (Kuran), the Hedypnus (Jerahi), the Choaspes (Kerkhah), and the Eulsenus (a branch of the same); in the Upper Zagros region, the Gyndes (Diyaleh), and the Greater and Lesser Zabs; in Mesopotamia, the Chaboras (Kha-bour), and Bilichus (Belik); finally, in Syria and Palestine, the Orontes or river of Antioch (Nahr-el-asy), the Jordan, and the Barada or river of Damascus.

Thus, besides the six great rivers of the Empire, forty other considerable streams fertilized and enriched the territories of the Persian monarch, which, though they embraced many arid tracts, where cultivation was difficult, must be pronounced upon the whole well-watered, considering their extent and the latitude in which they lay.
The Empire possessed, besides its rivers, a number of important lakes.
Omitting the Caspian and the Aral, which lay upon its borders, there were contained within the Persian territories the following important basins: the Urumiyeh, Lake Van, and Lake Goutcha or Sivan in Armenia; Lakes Touz-Ghieul, Egerdir, Bey-Shehr, Chardak, Soghla, Buldur, Ghieul-Hissar, Iznik, Abullionte, Maniyas, and many others in Asia Minor; the Sabakhah, the Bahr-el-Melak, and the Lake of Antioch in Northern Syria; the Lake of Hems in the Coele-Syrian valley; the Damascus lakes, the Lake of Merom, the Sea of Tiberias, and the Dead Sea in Southern Syria and Palestine; Lake Moeris and the Natron lakes in Egypt; the Bahr-i-Nedjif in Babylonia; Lake Neyriz in Persia Proper; the Lake of Seistan in the Iranic Desert; and Lake Manchur in the In dus valley.

Several of these have been already described in these volumes.