A rock cleft in Petra formed by the erosion caused by the by the winds blowing across the rocks over millions of years.The beautiful colours and strange rock formations in Petra and Wadi are unique. This wonderful, timeless artwork of nature, beautiful patterns that look like abstract paintings and shapes that defy description, are integral to the powerful effect that Petra has on us, as much if not more than the monuments themselves. The colours are derived from various manganese and iron oxides, along with hydroxides of minerals the sandstone itself.