1 Samuel 17:1-3

Now the Philistines gathered together their armies to battle, and were gathered together at Shochoh, which belongeth to Judah, and pitched between Shochoh and Azekah, in Ephes-dammim.

And Saul and the men of Israel were gathered together, and pitched by the valley of Elah, and set the battle in array against the Philistines.

And the Philistines stood on a mountain on the one side, and Israel stood on a mountain on the other side: and there was a valley between them.