Three Sisters, 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"This creek, and the two islands, one of which is half a mile long, and the second three miles, are called the Three Sisters: a beautiful plain extending on both sides of the river."