天てん井じょう川がわ

noun

raised river; elevated riverbed

A river whose bed has risen above the surrounding land due to sediment deposition, often contained by levees. A technical geographical term.

• 天てん井じょう川がわは、堤てい防ぼうが決けっ壊かいすると大おおきな被ひ害がいをもたらすことがある。

  A raised river can cause great damage if its levees break.