W., and running in that direction to the Shat-el-Arab, which it reaches about five miles below Kurnur.

Its length is estimated at above 500 miles; its width, at some distance above its junction with the Abi-Zal, is from eighty to a hundred yards.
The course of the Kerkhah was not always exactly such as is here described.

Anciently it appears to have bifurcated at Pai Pul, 18 or 20 miles N.W.of Susa, and to have sent a branch east of the Susa ruins, which absorbed the Shapur, a small tributary of the Dizful stream, and ran into the Kuran a little above Ahwaz.

The remains of the old channel are still to be traced; and its existence explains the confusion, observable in ancient times, between the Kerkhah and the Kuran, to each of which streams, in certain parts of their course, we find the name Eulseus applied.

The proper Eulseus was the eastern branch of the Kerkhah (Choaspes) from Pai Pul to Ahwaz; but the name was naturally extended both northwards to the Choaspes above Pai Pul and southwards to the Kuran below Ahwaz.