“Ulai” means pure water

Ulai: is mentioned by Daniel, (Daniel 8:2,16) as a river near to Susa, where he saw his vision of the ram and the he-goat. It has been generally identified with the Eulaeus of the Greek and Roman geographers, a large stream in the immediate neighborhood of that city. The Eulseus has been by many identified with the Choaspes, which is undoubtedly the modern Kerkhah , an affluent of the Tigris, flowing into it a little below Kurnah . Recent surveys show that the Choarspes once divided into two streams about 20 miles above Susa. The eastern was the Ulai. This bifurcation explains (Daniel 8:16)