The Nabataean water reservoir near Little Petra is an ancient rock-carved cistern system designed to collect and store rainwater in the desert environment. Skillfully engineered by the Nabataeans, it features deep basins, channels, and plastered walls that prevented water loss, ensuring a steady supply for travellers, animals, and nearby settlements. Surrounded by sandstone cliffs, the site demonstrates the Nabataeans’ advanced understanding of hydraulic engineering and their ability to thrive in arid conditions, making it a remarkable example of sustainable ancient design.