Les trois rivieres des Sioux, Missouri River, United States (Google Maps ⧉, OpenStreetMap ⧉)
Referenced In
History of the Expedition under the Command of Captains Lewis and Clark / To the Sources of the Missouri, Thence Across the Rocky Mountains and Down the River Columbia to the Pacific Ocean
by Meriwether Lewis, William Clark"These rivers are called by the French Les trois rivieres des Sioux, the three Sioux rivers;"