Answer: an area where all draining water goes into the same river system
Explanation:
A watershed is an area which occupies water from the rainfall and snow melt that drains into a water body such as marshes, river , streams and groundwater. This is also called as drainage basin because of the fact that the water from many sources drains into a common outlet.
On the basis of the above description, this can be said that a watershed is an area where all draining water goes into the same river system is the correct option.
