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Basin
The area drained by a river and its tributaries.
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Delta
Delta
A tract of land that is drained by a river and its tributaries.
A tract of land that is drained by a river and its tributaries.
A river system that operates inside a drainage basin. A drainage basin is the area of land drained by a river and its tributaries.
a wide mass of land drained by a river and its tributaries or draining into a lake.
The answer is Montana!
Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela
Drainage basin.