'Slope' in the Bible

Now when the king of Ai saw it, he got up quickly and went out to war against Israel, he and all his people, to the slope going down to the valley; but he had no idea that a secret force was waiting at the back of the town.

From there it goes south of the slope up to Akrabbim, and on to Zin, then south past Kadesh-barnea, and on by Hezron and up to Addar, turning in the direction of Karka:

Then the line goes up to Debir from the valley of Achor, and so to the north, in the direction of Gilgal, which is opposite the slope up to Adummim, on the south side of the river: and the line goes on to the waters of En-shemesh, ending at En-rogel: