I think you mean a 'ford'.
the Illinois river
A drainage divide on a mountain peak is a boundary separating water flow into different drainage basins on either side of the peak. Water that falls on one side of the peak flows into one river system, while water on the other side flows into a different river system.
The River Severn flows through towns and countryside.
Bosnia
On the side where the river flows slowest.
The North Side. It flows North and empties into the Mediterranean Sea.
I think you refer to the Watershed.... say rain falls on a mountain side & some of it eventually flows into the River Anything & some flows into the next valley, the River Zoobeedoobeedoo. Where the dividing line is, (Between the Anything & the Zoobeedoobeedoo) is the Watershed.
The Hudson River flows down the west side of Manhattan and the east side of New Jersey.
East and South of the center, on the North side of the James River between Richmond and Norfolk.
The river Dart flows into the English Channel, Kingswear on one side and Dartmouth on the other
None. Egypt is on the other side of the world from South America. If you are looking for the major river that flows from Africa thu Egypt, that is the Nile River.