“the valley of Achor.” The Valley of Achor (“Achor” means “trouble” or “disaster”) was named because that is where Achan and his family were stoned to death after bringing disaster to Israel in their defeat at Ai (Josh. 7:24-26).
“the ascent of Adummim.” This is the ridge that can be walked on the south side of the Wadi Kelt.
“the south side of the valley.” This valley is the Wadi Kelt, which runs from the hill country of Judah down towards the Dead Sea.
“ended at En-rogel.” This is in the Kidron Valley east of Jerusalem. It is mentioned in 1 Kings 1:9.