'River' in the Bible

“A river of fire was flowingAnd coming out from before Him;Thousands upon thousands were attending Him,And myriads upon myriads were standing before Him;The court sat,And the books were opened.

On the twenty-fourth day of the first month, while I was by the bank of the great river, that is, the Tigris,

Then I, Daniel, looked and behold, two others were standing, one on this bank of the river and the other on that bank of the river.

And one said to the man dressed in linen, who was above the waters of the river, “How long will it be until the end of these wonders?”

I heard the man dressed in linen, who was above the waters of the river, as he raised his right hand and his left toward heaven, and swore by Him who lives forever that it would be for a time, times, and half a time; and as soon as they finish shattering the power of the holy people, all these events will be completed.