Joshua 4:8-9

The People of Israel did exactly as Joshua commanded: They took twelve stones from the middle of the Jordan—a stone for each of the twelve tribes, just as GOD had instructed Joshua—carried them across with them to the camp, and set them down there. Joshua set up the twelve stones taken from the middle of the Jordan that had marked the place where the priests who carried the Chest of the Covenant had stood. They are still there today.