A drainage basin is the area where these tributaries collect rainwater. A river with all its tributaries is called a river system.
流域是支流蓄水的区域。一条河流连同它的全部支流一起，叫做水系。
The Amazon has over a thousand tributaries feeding into it. The entire river system is the size of North America.
亚马孙河由一千多条支流汇交而成。整个水系覆盖的面积如北美洲一样大。
Yisusi river Basin has about 510 rivers and tributaries that being connected and formed one of most complex water system in the country.
沂沐泗流域有干支河流510余条，河流相通互连，是全国最复杂的水系之一。
Yisusi river Basin has about 510 rivers and tributaries that being connected and formed one of most complex water system in the country.
沂沐泗流域有干支河流510余条，河流相通互连，是全国最复杂的水系之一。
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