What does 流域 mean?
流域 is a Japanese noun meaning “(river) basin” in English. It is written as 流域 in kanji, りゅういき in hiragana, and ryuuiki in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
ダムが切れて流域に大水が押し寄せた。
The dam gave way and sent a great flush of water down the valley.