Alluvial fans form when rapidly flowing waters deposit sediment onto plains at the end of their run. Sediment builds up over thousands of years, forming fan-shaped deposits. In dry seasons, slow-flowing streams carry less sediment, eroding paths into existing fans instead.
Common in western Jordan where canyons terminate at the Dead Sea and Wadi Araba (north of Aqaba). The pictured alluvial fan is where Wadi Mujib terminates at the Dead Sea, at the GPS coordinates: 31.4666°, 35.5726°.