Triple Divide Peak, Montana

Triple Divide Peak is a place that challenges the notion of a binary Continental Divide. The east side of the peak is drained by Atlantic Creek, which flows into the Cut Bank River, which flows into the Marias River, which flows into the Missouri River, which flows into the Mississippi, which drains into the Atlantic Ocean. The west side of the peak is drained by Pacific Creek, which flows into Nyack Creek, which flows into the Flathead River, which flows into the Clark Fork River, to the Pend Oreille River, to the Columbia River, which drains into the Pacific Ocean. The north side of the peak, however, drains into Hudson Bay Creek, which as the name implies, flows, eventually into Hudson Bay, in the Canadian north, which opens into the Arctic. Not all of the water gets there though. Hudson Bay Creek flows into Red Eagle Creek, which flows into St. Mary Lake, which flows through a channel behind the Glacier National Park visitor center, leaving the park and entering Lower St. Mary Lake. At the other end of that lake is a diversion dam, where much of the flow of the St. Mary River is diverted into a canal. After a few more miles, and just a few miles from the Canadian Border, the canal crosses over the river in a set of pipes, and heads eastward, to irrigate fields in the USA. What remains of the St. Mary River flows into Canada, and is a source for agricultural water in Alberta, before draining into Hudson Bay.