Ulai was the Eulaus of the Greeks, a river of Susiana. The Ulai may have been 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. Another possible location of this river is the Rud-e Karun, a tributary of the Shatt al-Arab(known as Arvand Rud in Iran) . Ulai mentions in the Bible: