The Siq is a kilometer-long natural gorge and the main entrance to the ancient city of Petra. The Moses Spring originally flowed through the Siq until the Nabateans diverted it to prevent floods, opting instead to bring water into the city through controlled water channels on both sides of the Siq. The Siq is adorned with a number of niches depicting Nabatean deities, an eroded relief of a camel caravan, and some inscriptions. A triumphal arch originally spanned the Siq’s entrance. To the right of the entrance, there is another narrow and rugged Small Siq, which a dam diverts water into.
The main Siq begins a short distance from the Petra Visitors Center (entrance and parking area) and ends at the Treasury monument. The Small Siq begins to the right of the main Siq’s entrance and leads north of the city.