'Slope' in the Bible
While they were fleeing in front of Israel and descending the slope of Beth-horon, the LORD rained down huge hailstones on them as far as Azekah, and they died. More died because of the hailstones than were killed by the Israelis in battle.
Their border started on the north side at the Jordan River, proceeded to the slope of Jericho on the north, then westward through the hill country, and terminated at the wilderness of Beth-aven.
From there the boundary proceeded south in the direction of Luz to the slope of Luz (also known as Bethel), then proceeded to Ataroth-addar, on the mountain that lies south of Lower Beth-horon.
From there the boundary proceeded to the border of the mountain that overlooks the Ben-hinnom Valley at the northern end of the Rephaim Valley, where it proceeded down the Hinnom Valley south of the slope of the Jebusites toward En-rogel.
From there the boundary proceeded to north of the slope of Beth-hoglah and terminated at the northern bay of the Salt Sea where the Jordan River ends in the south. This was the southern border.