Sepulchre Island, Columbia River (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"Three miles below Cataract river we passed three large rocks in the river; that in the middle is large and longer than the rest, and from the circumstance of its having several square vaults on it, obtained the name of Sepulchre island."