Continental Divide
oklahoma's rivers flow south-east
It doesn't have to be a high ridge, but in any event, it is the 'Continental Divide'.
Rocky Mountains
the Ural Mountains
your MHz ghat gig
south
The Continental Divide (in North America) marks the direction (towards the Pacific or Atlantic and Gulf of Mexico) rivers flow.
Yes
Mexico
South
Rivers always flow downhill, regardless of compass direction. It is a myth that rivers "normally" flow from north to south.
Concentration gradient determines the direction of flow.