RED LINES: route of expedition.
BLUE LINES: Missouri River begins in upper left beginning at Three Forks and heading north. Yellowstone River begins in lower center at Yellowstone lake heading north through Gardiner and Livingston and then heading East to Billings and beyond to North Dakota border where it joins the Missouri.
An interactive version of this Expedition Route on Google Maps offers enlarged views and explanatory detail. (Opens in a new window.)