'River' in the Bible

Then David defeated Hadadezer the son of Rehob, king of Zobah, as he went to restore his power at the River [Euphrates].

Hadadezer sent word and brought out the Arameans who were beyond the River [Euphrates]; and they came to Helam; and Shobach the commander of the army of Hadadezer led them.

After they left, Jonathan and Ahimaaz came up out of the well and went and informed King David, and said to David, “Arise and cross over the Jordan River quickly, for Ahithophel has advised [an attack] against you.”