The Siq is the main entrance to the ancient Nabatean city of Petra in southern Jordan. Also known as Siqit, the main entrance in Petra is a dim, narrow gorge winds its way approximately 1.2 kilometres and ends at Petra's most elaborate ruin, Al Khazneh. A wide valley outside leading to the Siq is known as the Bab as-Sīq.
Unlike slot canyons such as Antelope Canyon in the American Southwest, which are directly shaped by water, the Siq is a natural geological fault split apart by tectonic forces; only later was it worn smooth by water. The walls that enclose the Siq stand between 91–182 metres in height.The entrance to the Siq contains a huge dam, reconstructed in 1963 and again in 1991, designed to bar the mouth of the Siq and reroute the waters of Wadi Musa.
Petra official tourism website http://visitpetra.jo/Petra/HistoricLocationDetails.aspx?lid=24
Address (Unnamed Road), Jordan
Coordinates 30°19'23.178" N 35°27'0.667" E