'Canal' in the Bible

I saw the vision, and as I watched, I was in the fortress city of Susa, in the province of Elam. I saw in the vision that I was beside the Ulai Canal.

I looked up, and there was a ram standing beside the canal. He had two horns. The two horns were long, but one was longer than the other, and the longer one came up last.

He came toward the two-horned ram I had seen standing beside the canal and rushed at him with savage fury.

I heard the voice of a man calling out from the Ulai Canal, "Gabriel, interpret what that fellow has been seeing.'