the drainage basin
Mississippi River
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
The River Trent.
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 Susquehanna river does because it's tributaries run all the way up to New York . The rain up in New York runs in to storm drains up there and the water travel through the system of drains down to the Susquehanna river in to the Chesapeake bay.