The document summarizes the major geographic regions of the United States. It describes 6 regions: 1) the Coastal Plain along the Atlantic and Gulf Coasts, 2) the Appalachian Mountains west of the Coastal Plain, 3) the Canadian Shield wrapped around Hudson Bay with old rock formations and many lakes, 4) the Interior Lowlands between the Appalachians and Great Plains with rivers and valleys, 5) the Great Plains a flat region west of the Interior Lowlands, and 6) the Rocky Mountains west of the Great Plains containing the Continental Divide.