2. Rivers of the United States St. Lawrence River  Pacific Ocean Atlantic Ocean Gulf of Mexico Hudson River  Delaware River  Missouri River  Mississippi River  Potomac River  Snake River  Rio Grande  Savannah River  Columbia River Colorado River  Ohio River  Chesapeake Bay Great Salt Lake  Lake Michigan  Lake Superior  Lake Huron  Lake Ontario  Lake Erie  Susquehanna River 

3. Topographical Map of the United States Appalachian Mountains  Adirondack Mountains   Rocky Mountains  Cascade Mountains  Sierra Nevada Mountains  Pacific Coastal Mountains Great Plains  Grand Canyon  Columbia Plateau

4. Delaware Water Gap

5. Hudson River Gorge

6. Snake River

7. Columbia River

8. Appalachian Mountains

9. Rocky Mountains

10. Cascade Mountains

11. Great Plains