Where would you find an alluvial fan?

Alluvial fans are formed when water and sediments pass through a narrow gap between hills, mountains or canyon walls and then slows down and spread out when it reaches an open plain.

Alluvial fans and bajadas are often found in deserts, where flash floods wash alluvium down from nearby hills. They can also be found in wetter climates, where streams are more common. Alluvial fans are even found underwater