'Downstream' in the Bible

When the feet of the priests carrying the ark of the Lord, the Ruler of the whole earth, touch the water of the Jordan, the water coming downstream toward you will stop flowing and pile up."

the water coming downstream toward them stopped flowing. It piled up far upstream at Adam (the city near Zarethan); there was no water at all flowing to the sea of the Arabah (the Salt Sea). The people crossed the river opposite Jericho.