12km, 8h trek starts from Devil's Gates, crosses colorful sands on the bottom of the Makhtesh and then ascents one of the walls. From there almost an hour walk on the edge before descending (very steep at the end) via Wadi Mazar.
Route description is here:
http://www.tiuli.com/track_info.asp?track_id=54
© Photographs by Olga and Kirill