'Beyond the River' in the Bible

Joshua said to all the people, "Thus says the LORD, the God of Israel, 'Your fathers lived of old time beyond the River, even Terah, the father of Abraham, and the father of Nahor: and they served other gods.

I took your father Abraham from beyond the River, and led him throughout all the land of Canaan, and multiplied his seed, and gave him Isaac.

Now therefore fear the LORD, and serve him in sincerity and in truth. Put away the gods which your fathers served beyond the River, in Egypt; and serve the LORD.

If it seems evil to you to serve the LORD, choose this day whom you will serve; whether the gods which your fathers served that were beyond the River, or the gods of the Amorites, in whose land you dwell: but as for me and my house, we will serve the LORD."