US Geography Play these games to learn or review the major geographical features of the United States. Tools A B Appalachian Mountains old mountain range that extends from Maine to Georgia Rocky Mountains major US mountain range that runs from Canada to Mexico Cascade Range mountain range of the Northwest (Washington & Oregon) Sierra Nevada mountain range of California Atlantic Ocean ocean that forms eastern border of the USA Pacific Ocean ocean to the west of North America Gulf of Mexico body of water south of Louisiana Caribbean Sea body of water between North & South America Great Lakes Superior, Michigan, Huran, Erie, Ontario Grand Canyon famous geographical feature along the Colorado River Canada country to the north of the USA Mexico country to the south of the USA Mississippi longest US river Missouri major tributary of the Mississippi that begins in Montana Ohio major tributary of the Mississippi that begins in Pennsylvania Yukon major river of Alaska Columbia major river that forms part of Washington/Oregon border Rio Grande river that forms part of US/Mexico border St. Lawrence river that forms part of US/Canada border Hawaii islands in the Pacific Ocean; 50th state