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Specified area where water reaches a river:
1. Watershed
2. River Basin
3. Catchment area
4. Water separator

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Best answer
Correct Answer - Option 1 : Watershed

The correct answer is Watershed.

  • The river and its tributaries together form the river system.
  • The area where all the water gets to the river system is called the drainage basin (watershed).
  • The river goes through the young stage, the mature stage, and the old stage in its lifespan.
  • These stages are related to the slope of its alluvial.
  • In its youth and old age, the river forms landforms in its cascade.
  • The area that provides water (surface and groundwater) to the river is called the "river basin".
  • This is the area that can be called the body of a river.
  • Catchment area-
    • The entire area whose flowing water reaches a river or stream is called the Catchment area of that river.
  • River Basin -
    • All the land area (catchment area) as far as water flows through a river and its tributaries.
  • Watershed-
    • It is a land area that drains all the streams, rainfall, and rivers to a common outlet.​

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