流域(りゅういき)

りゅういき
noun
river basin; watershed; drainage area
1. river basin; watershed; drainage area
The entire area of land drained by a river and its tributaries.
利根川(とねがわ)の流域(りゅういき)は広(ひろ)い。
The Tone River basin is vast.
流域(りゅういき)の住民(じゅうみん)に避難(ひなん)勧告(かんこく)が出(で)た。
An evacuation advisory was issued to residents of the river basin.
この川(かわ)の流域(りゅういき)には多(おお)くの農地(のうち)が広(ひろ)がっており、水(みず)の管理(かんり)が重要(じゅうよう)だ。
Many farmlands extend across this river's basin, making water management important.

A compound of 流(りゅう) (flow, current) and 域(いき) (area, zone). A geographic term commonly encountered in news about floods, water management, and environmental topics.

USAGE:
Frequently appears in weather reports and disaster-related news, especially during the rainy season (梅雨(つゆ)) and typhoon season. Often combined with specific river names: 利根川(とねがわ)流域(りゅういき), 信濃川(しなのがわ)流域(りゅういき).

COMMON COLLOCATIONS:

  • 流域(りゅういき)面積(めんせき) — basin area
  • 流域(りゅういき)住民(じゅうみん) — basin residents
  • 上(じょう)流域(りゅういき) — upper basin
  • 下(か)流域(りゅういき) — lower basin

RELATED TERMS:

  • 上流(じょうりゅう) — upstream
  • 下流(かりゅう) — downstream
  • 水系(すいけい) — river system; the network of rivers and streams
general
Added 2026.3.26 20:43
19500/19664_ryuuiki