It's drainage area is 1061469 km.
The answer is The Niger River
red river
1000,2000,5897km
Drainage basin.
River Indus's drainage basin has an area of 1165000 square kilometers.
the red river
The Niger River
A river system that operates inside a drainage basin. A drainage basin is the area of land drained by a river and its tributaries.
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The area drained by a river and its tributaries.
Drainage basin is also called catchment, catchment area, catchment basin, drainage area, river basin, and water basin. It is an area of land. All water that falls on that land flows into one river.
Lake Alexandrina is the lake at the mouth of the Murray River. It has a surface area of about 570 square km.