Do all rivers flow north to south?

No, not all rivers flow north to south. The direction in which a river flows is determined by various factors, including the slope of the land, gravity, and the Earth's rotation. Rivers generally flow from higher elevations to lower elevations, following the path of least resistance. The direction of a river's flow is not limited to a specific cardinal direction. There are rivers that flow east to west, west to east, and in other directions.