'River' in the Bible

I saw in the vision; now it was so, that when I saw, I was in the citadel of Susa, which is in the province of Elam; and I saw in the vision, and I was by the river Ulai.

Then I lifted up my eyes, and saw, and behold, there stood before the river a ram which had two horns: and the two horns were high; but one was higher than the other, and the higher came up last.

He came to the ram that had the two horns, which I saw standing before the river, and ran on him in the fury of his power.

In the four and twentieth day of the first month, as I was by the side of the great river, which is Hiddekel,

Then I, Daniel, looked, and behold, two others stood, one on the river bank on this side, and the other on the river bank on that side.

One said to the man clothed in linen, who was above the waters of the river, How long shall it be to the end of these wonders?

I heard the man clothed in linen, who was above the waters of the river, when he held up his right hand and his left hand to heaven, and swore by him who lives forever that it shall be for a time, times, and a half; and when they have made an end of breaking in pieces the power of the holy people, all these things shall be finished.