Higher elevation. Ridges separate rivers, which at their most elemental level are runoff (from springs or precipitation). As patterns of runoff converge, permanent streams form.
The rocky mountains are the greatest source of rivers in the west. The rocky mountains form the continental divide.
The Continental divide is located in the rocky Mountains and when you travel east to west or west to east you will see a sign in the rocky Mountains that says "you have reached the Continental divide".
Rocky Mountains
In North America a high ridge of the Rockies know as the the great divide separates the the waters flowing west toward the Atlantic Ocean.
Rocky Mountains
The Rocky Mountains
they passed 34 rivers in the rocky mountains
there are no rivers flowing in to the mountains however many flow out --Colorado-- SouthPlatte--RioGrande--Laramie--
rivers streams filled from the rocky mountains.
the continental divides sit along the rocky mountains and seperates the flow of rivers
the rockies are located between the Rio grande in the south & the liard river in the north & of course they themselves shed dozens of rivers to their east & west perhaps most notably the Missouri & Columbia systems respectively
The mountain range that forms the boundary between British Columbia and Alberta in Canada is the Rocky Mountains. The highest point in Alberta is called Mount Columbia.