The Arnon is a river and wadi in western Jordan, known in modern times in Arabic as Wadi Mujib. Its length is about 72 km (45 miles), from its highlands in the desert to its entrance into the Dead Sea. It broadens to a width of 30 meters (100 feet) locally, but for the most part is narrow. Though low in summer, it runs as a torrent in the rainy winter season and is 2 to 3 meters (8 or 10 feet) deep in places. Its course flows northwesterly, but downstream its course becomes westerly.

The Amon's most striking feature is the steepness and narrowness of the ravine through which it passes shortly before it empties into the Dead Sea, opposite Ein Gedi. Between the lofty limestone hills, which cause this precipitous descent, and the sea, the river expands into a shallow estuary nearly 30 meters (100 feet) wide.