Wadi Rum, located in southern Jordan, is a protected desert wilderness characterized by a dramatic "valleys and peaks" landform known as a wadi (an ephemeral river valley). The landscape is dominated by massive monolithic mountains of sandstone and granite that rise abruptly from the flat sandy valley floor. These formations have been sculpted over millions of years by wind and water erosion, resulting in natural arches, deep narrow canyons (siqs), and towering cliffs. The most famous peaks include Jebel Rum and Jebel Um Ishrin. The sand in Wadi Rum is renowned for its vibrant red and orange hues, caused by the presence of iron oxide. Geologically, it is part of the Hisma desert and is unique because it combines high-altitude plateaus with vast, open desert plains. This "otherworldly" appearance is why it is frequently used as a filming location for movies set on Mars or alien planets. It is not a "sea of dunes" like the Sahara, but rather a rugged, rocky landscape that showcases the power of geological forces.