Great Plains, A large, flat region in the middle of the U.S. with fertile grasslands and wide open land., Coastal Plain, Low land near the ocean with rivers, swamps, and marshes that gently slope toward the sea., Basin and Range Province, A western region with many small mountain ranges, valleys, flat plains, and some deserts., Central Plains (Lowlands), Flat land in the center of the country that was shaped long ago by glaciers., Piedmont, low, fertile plateau with many rivers, located between the mountains and the coastal plain., Rio Grande, The river that forms the border between Texas and Mexico., Mississippi River System, The largest river system in North America., Mississippi River, The major river that drains water from land between the Appalachian Mountains and the Rocky Mountains., Tributary, A smaller river or stream that flows into a larger river., Continental Divide, A high land feature that separates rivers flowing to different oceans., Rocky Mountains, Tall western mountains that are part of the Continental Divide., Pacific Mountain System, A western region with mountains and valleys where many earthquakes happen, Appalachian Mountains, A mountain range along the eastern U.S. with rolling hills, forests, cliffs, valleys, and lakes., Grand Canyon, A huge, deep gorge in Arizona that is about 1 mile deep and 277 miles long., Gulf of Mexico, What gulf borders the southern United States?, Canda, What country borders the United States to the north?, Mexico, What country borders the United States to the south?, Atlantic Ocean, What ocean borders the United States on the east?, Pacific Ocean, What ocean borders the United States on the west?.

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