Ulai

The Eulaus of the Greeks; a river of Susiana. It was probably "the eastern branch of the Choasper (Kerkhan), which divided into" two branches some 20 miles above the city of Susa. Hence Daniel "(8:2, 16) speaks of standing "between the banks of Ulai", i.e.," between the two streams of the divided river.

Definition of Ulai:
"strength; fool; senseless"