What determines which way a river will flow? its location in relation to a drainage divide
the flow of rivers entering into it
its depth
its width

Which way a river will flow is determined by its location in relation to a drainage divide.

Explanation:

The rivers are water bodies that have flowing water. They flow from higher to lower ground, and they can go in any direction where the water can move freely or more easily. Some rivers tend to be more straight, some more meandering, or have numerous drastic changes in direction.

It is actually very simple what determined the way a river will flow. The location of the river in relation to a drainage divide is the biggest factor. The drainage divide basically represents a natural barrier for the movement of the water, thus anything moving on one side of it will move on that side only, as the water can not go up. Every twist and turn of the river is determined by the topography within the drainage basin, as well as the composition of the rocks.