流域 liúyù river basin
river basin; valley; drainage area
How to remember 流域: 流 flow + 域 area = river basin.
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How it is used
- 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.