In the previous post about our backpacking trip in Glacier National Park, I wrote about the hydrological rarity that is Triple Divide Peak. There, water flows to three major North American drainages: the Pacific, Atlantic and Hudson Bay. How rare is this feature? There are two others, one in Canada and one in Siberia.
Here's a map of Glacier's Triple Divide; click the markers for more information.
View Triple Divide Pass in a larger map