I wrote yesterday about feeling the jolt of space and time when Top O' and I were quickly transported back to Wyoming. It's no wonder. We had been walking for weeks on high mountain ridges that were often above the treeline. Then just 48 hours after that, we found ourselves more than 300 miles (roughly 500 miles by car) north and in a far different treeless environment.
We were walking on the Continental Divide then. Now we are back in the Great Divide Basin, which couldn't be more different.
The direction water flows is determined by the slope of the Continental Divide. If it falls on one side of that hydrological dividing line, it becomes part of a system of streams, rivers, and lakes that ultimately reaches the Atlantic Ocean. Water falling on the other side of the line will flow toward the Pacific Ocean.
That doesn't happen in the Great Divide Basin. It is what's called an endorheic basin. Water neither flows in nor out of this territory. There are many of these basins, and they can be found on every continent.