the great plains
A watershed is the area separating two different drainage basins/river systems.
The Continental Divide of the Americas is an example of a mountain ridge that separates river systems. Further examples include Northern Divide or Laurentian Divide.
A divide
A mountain ridge that separates river systems is called a watershed or a drainage divide. This geographic feature determines the direction in which water flows, dividing the flow of water into different river basins.
continmental dividecontinental divide
That would be the Columbia River. This river separates approximately two thirds of southern Washington from northern Oregon. At a place on the 46th parallel north this river total enters the state of Washington, and this parallel becomes the border line that separates the two states.
there are no river in paraguay!
The eural river separates Europe from Asia
The name for a mountain range that separates river systems that flow in opposite directions is called a "watershed" or "divide." More specifically, it can be referred to as a "continental divide" when it separates river systems that drain into different oceans or seas. An example of this is the Continental Divide in North America, which distinguishes rivers flowing toward the Pacific Ocean from those flowing toward the Atlantic Ocean.
Ural River. It is the traditional boundary that separates Europe and Asia.
There is no single river that separates all the states of Australia.However, the Murray River separates the two states of Victoria and New South Wales, forming the border for much of the way before continuing into South Australia.
The Chattahoochee River separates the Eastern and Central Time Zones