U.S physical mappppppOnline version Diana Perez by Diana Perez 1 Lake Michigan 2 Lake Huron 3 Lake Erie 4 Lake Ontario 5 Lake Superior 6 Ohio River 7 Mississippi River 8 Atlantic Ocean 9 Pacific Ocean 10 Hudson River 11 Rio Grande 12 Columbia River 13 Arkansas River 14 Missouri River 15 Wabash River 16 James River 17 St. Lawrence River 18 Potomac River 19 Cape Cod 20 Rocky Mountains 21 Piedmont 22 Appalachian Mtns. 23 Great Salt Lake 24 Cascade Mountain 25 Massachusetts Bay 26 Great Plains 27 Sierra Nevada Mountains 28 Chesapeake Bay 29 Gulf of Mexico 30 Cumberland Gap 31 Great Smoky Mtns.