I Samuel 17:1-3

Now the Philistines gathered their armies together to battle, and were gathered at Sochoh, which belongs to Judah; they encamped between Sochoh and Azekah, in Ephes Dammim. And Saul and the men of Israel were gathered together, and they encamped in the Valley of Elah, and drew up in battle array against the Philistines. The Philistines stood on a mountain on one side, and Israel stood on a mountain on the other side, with a valley between them.