Alula: The rock cavities scattered across various sites in AlUla are natural formations that have contributed to preserving rainwater for extended periods, due to their geological structure and their ability to collect water within natural rock hollows.

According to Saudi Press Agency, in the past, the people of AlUla relied on these cavities as an important water source. Farmers used them to irrigate their crops and provide drinking water for livestock, serving as a vital support for agricultural and pastoral life in the region.

These cavities are formed as a result of natural erosion processes that create rock hollows capable of retaining water after rainfall. This provides a temporary water reserve that can be used when needed, reflecting human ability to adapt to the natural environment and utilize its available resources.

These cavities embody a facet of inherited local environmental knowledge and demonstrate natural solutions for water management in arid environments. They serve as a testament to the balanced relationship between humans and their resources, highlighting the importance of these natural formations in supporting traditional livelihoods in AlUla.