扇せん状じょう地ち

noun

alluvial fan; alluvial delta

A fan-shaped deposit of sediment formed where a river or stream flows from a steep gradient onto a flatter plain. In Japanese geography, 扇状地 is the standard term.

• この扇せん状じょう地ちは、川かわが山やまから平へい野やに出でるところにできた。

  This alluvial fan formed where the river emerges from the mountains onto the plain.

• 扇せん状じょう地ちは水みずはけが良よいため、果か樹じゅ園えんに利り用ようされることが多おおい。

  Alluvial fans are often used for orchards because of their good drainage.