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The term “Sionne alluvial fan” refers to an alluvial fan located in the Sionne region of Valais, Switzerland. Alluvial fans are geological formations composed of sediments (sand, gravel, etc.) that accumulate at the base of mountains or hills where streams abruptly change gradient, causing the sediment to spread out in a fan shape. The Sionne fan is likely formed by the Sionne river and its tributaries, depositing material as the river enters the valley.
