The Siq, which is the main road leading to the city of Petra, starts at the Dam and ends at the opposite side of the vault, a split rock with length of about 1200 m and a width of 3-12 m, and height up to about 80 m; most of the rock is natural and another part was sculptured by the Nabataeans.  The Siq, the main road that leads to the city, it starts from the Dam and ends at the Treasury.  It is a rock canal that measures 160 meters in length, 3-12 meters in width and reaches up to 80 meters in height. The main part of the Siq is created by natural rock formation and the rest is carved by the Nabataens.

At the beginning of the Siq, one can still view the remains of the city’s gate. On both sides of the Siq, there are channels to draw water from Wadi Musa (the Valley of Moses), from outside the city to the inside.

From the right, it is evident that the water flows through pipes of pottery but on the left channel, rock is carved and covered with panels of stone, and there are spaces in place to filter water. At the dam side, one can see the place of the original Nabataean dams, which were intended to prevent the flow of water to the Siq, and seize and use the water. The Siq ground paved with stone slabs, part of which can be viewed in its original location.

Aspects of the Siq were decorated with Nabataean sculptures, mostly representing the gods. It is believed that the statues of gods and their sculptures were situated very close and even adjacent to the channels due to the Nabataeans’ beliefs and faith in that sacred water. In addition, on the left side there are idols called Sabinos Statues.