Columbia River Valley, Oregon, 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"…it grows so abundantly in the fertile valley of Colombia, and the islands, that the country is almost impenetrable: it retains its verdure late in summer."