At the end of a gravel road, in a pasture on a hill, raindrops falling in the same area, landing only a few inches apart, will merge into one of three springs, all within less than a thousand yards of one another. These three tiny springs eventually become small brooks, then large streams, which become whole rivers that go to one of three seas, the Atlantic Ocean, the Gulf of Mexico and the North Atlantic Ocean.
When a raindrop falls there it can split three ways:
In one direction, it flows west to the Allegheny River, down the Mississippi watershed and into the Gulf of Mexico.
Or it flows north to the Genesee River, Lake Ontario, the Saint Lawrence watershed and into the north Atlantic.
Or it flows southeast to Pine Creek, the Susquehanna River, Chesapeake Bay and the Atlantic Ocean.