Prospect island, 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"Four miles farther, the lower point of Prospect island, about two and a half miles in length; opposite to this are high bluffs, about eighty feet above the water."