'River' in the Bible

Also at the same time Solomon kept the feast seven days, and all Israel with him, a very great congregation, from the entering in of Hamath unto the river of Egypt.

And he reigned over all the kings from the river even unto the land of the Philistines, and to the border of Egypt.

Then many people were gathered, and they blocked off all the springs and the river that flowed through the midst of the land, saying, "Why should the kings of Assyria come and find much water?"

Some time after all of this, after Josiah had finished preparing the Temple, King Neco of Egypt invaded Carchemish on the Euphrates River, and Josiah went out to fight him.