The shaping of a continent.|The watery rim: rocky seacoast, sand beaches, corals and deltas, the western boundary.|The inland waters: rivers and waterfalls, lakes and bogs, springs, geyers, caves.|The mountains: Appalachian, the Great Divide, The Pacific Rim.|The forests: Forest primeval, Western giants.|The drylands: sea of grass, high plateau, The Great American Desert.|Outstanding natural areas of North America by state and province.