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.
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
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St.Lawrence river
The area from which water drains into a river is called the river's watershed or drainage basin. It includes all the land and waterways that contribute runoff to that particular river system. Rainfall and other sources of water collect in the watershed, eventually flowing into the river and its tributaries.
the drainage basin
river
river