The waste, probably some high waste land to the south of the Dead Sea (Num. 21:20; 23:28; 1 Sam. 23:19, 24); or rather not a proper name at all, but simply "the waste" or "wilderness," the district on which the plateau of Ziph (q.v.) looks down.
solitude; desolation ...
Hitchcock's Bible Names Dictionary
(a wilderness), a name which occurs in (Numbers 21:20) and Numb 23:28 In designating the position of...
William Smith's Bible Dictionary