We saw a sign in passing saying "Continental Divide" a third of the way across North Dakota. "What!?" I wondered. I asked the elderly greeter at the State Museum in Bismarck.
It turns out that we'd passed its complement without fanfare in Minnesota, entering the Hudson Bay watershed, and then exiting it again in North Dakota. Yes, we were on the downhill side of the continent toward the North Pole for a few hundred miles without knowing it!