Bible Dictionaries
Ulai

　　Or Euleus, a river which ran by the city Shushan, in Persia, on the bank of which Daniel had a famous vision, Daniel 8:2,16 . It was the Choaspes of the Greeks, and is now called the Kerkhah; but appears to have had in ancient times a second channel, still traceable, nine hundred feet wide and twenty feet deep, and flowing along the east side of Shushan. The two channels emptied their waters through the river now called the Karun into the Shat-el-Arab, the united stream of the Euphrates and Tigris, twenty miles below their junction at Korna.