‘ And the border of the Amorites was from the ascent of Akrabbim, from Sela and upwards.'
Akkrabim was a mountain pass at the southern end of the Dead Sea (Numbers 34:4; Joshua 15:3), between the Arabah (the rift valley of Jordan) and the hill country of Judah. Sela means ‘the rock' and could be used of any rocky place.