The River Trent.
the area from which water drains into a river is called the river's catchment. A river's watershed is the connecting ridges surrounding the watershed, and separating it from adjacent ones.
Its a reservoir :)
Watershed
It drains into the Mississippi river.
This is the land, near a river, the excess water of which, drains into the given river
Watershed
gujrat
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St.Lawrence river
the drainage basin
river
river