The Continental Divide

If you have been following the River List you will have noticed that the rivers up to and including the Missouri drain into the Atlantic Ocean via the Gulf of Mexico, while all those after it in the list drain into the Arctic Ocean, hence a continental divide, the so called Northern or Laurentian Divide. Still not exactly sure where they are, we can assume Dee and Cal are approaching or have passed the Great Continental Divide, beyond which the rivers all flow into the Pacific Ocean. Travel plans posted before they started call for Dee and Cal to return by way of Glacier National Park (or near it), where the Northern and the Great Divides converge in a "triple point".