The meaning of Ziz, Ascent Of in the Bible
(From International Standard Bible Encyclopedia)

ziz (ma'aleh ha-tsits; Hasae, Hasisa): A pass in the wilderness of Judea (II Chronicles 20:16) leading from Hazazon-tamar (En-gedi, II 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.

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