Answer:
The Top of the Continental Divide determines the flow's direction of a river.
Step-by-step explanation:
The Continental Divide determines the flow's direction of a river as it separates the watersheds that drain into the Pacific Ocean from the rivers that drain into the Atlantic Ocean. In the United States, the West part of the Continental Divide makes the water flow towards the Pacific Ocean, while the East part makes the water flow towards the Mississippi River and the Gulf of Mexico.