Easton's Bible Dictionary Projecting; a flower, a cleft or pass, probably that near En-gedi, which leads up from the Dead Sea (2 Chronicles 20:16) in the direction of Tekoa; now Tell Hasasah. Int. Standard Bible Encyclopedia ZIZ, ASCENT OF ziz (ma`aleh ha-tsits; Hasae, Hasisa): A pass in the wilderness of Judea (2 Chronicles 20:16) leading from Hazazon-tamar (En-gedi, 2 Chronicles 20:2). This is generally identified with Wady Chacaca, a valley by which the ancient road from En-gedi runs toward Jerusalem. At any rate, an echo of the ancient name survives here: possibly the actual ascent was the present steep pass from En-gedi to the plateau above. See PEF, Sh XXI.

Multi-Version Concordance Ziz (1 Occurrence) 2 Chronicles 20:16 Tomorrow go down against them: behold, they come up by the ascent of Ziz; and you shall find them at the end of the valley, before the wilderness of Jeruel. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)