the watershed is the divide line between neighbouring drainage basins precipitation landing on a particular side of the watershed will stay in that drainage basin until it is evaporated or reaches the sea.
A drainage basin is an extent or area of land where water from rain and melting snow or ice drains downhill into a body of water, such as a river, lake, reservoir, estuary, wetland, sea or ocean.A...
drainage basins are rivers and strems all conected to one large rivertake the Mississippi river for an exampleit is so long and big with a bunch of littler rivers and streams branching off of it