This was the very wilderness in which Israel more than 500 years before had wanted water; and where the Lord had miraculously provided them with water. See Numbers 20:1-11.
Related Commentaries of 2 Kings 3:8
2 Kings 3:8-9
8 And he said, Which way shall we go up? And he answered, The way through the wilderness of Edom.
9 So the king of Israel went, and the king of Judah, and the king of Edom: and they fetched a compass of seven days' journey: and there was no water for the host, and for the cattle that followed them.