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Alluvial fan
fan- or cone-shaped deposit of sediment crossed and built up by streams / From Wikipedia, the free encyclopedia
An alluvial fan is a fan-shaped deposit of soil and rocks. It forms where a fast-flowing river spreads out over a flat plain. They are usually found in between mountain ranges that are crumbling away. If it rains a lot, the fan area will usually flood.[1][2]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/7/7d/Alluvial_fan%2C_Taklimakan_Desert%2C_XinJiang_Province%2C_China%2C_NASA%2C_ASTER.jpg/640px-Alluvial_fan%2C_Taklimakan_Desert%2C_XinJiang_Province%2C_China%2C_NASA%2C_ASTER.jpg)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/3/30/Alluvial_fan_in_Iran.jpg/640px-Alluvial_fan_in_Iran.jpg)