流域 liúyù river basin
river basin; valley; drainage area
怎么记住“流域”: 流 flow + 域 area = river basin.
汉字
用法
- A geographic term: a river basin / drainage area - 长江流域 (Chángjiāng liúyù) the Yangtze River basin.
- Refers to the whole region whose water drains into one river system, used in geography and environmental contexts.
- Not a single valley (山谷) but the entire catchment area named after its main river.