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United States (39.78373 -100.44588)
The Rocky Mountains, at the western edge of the Great Plains, extend north to south across the country, reaching altitudes higher than 14,000 feet (4,300 m) in Colorado. Farther west are the rocky Great Basin and deserts such as the Chihuahua and Mojave. The Sierra Nevada and Cascade mountain ranges run close to the Pacific coast, both ranges reaching altitudes higher than 14,000 feet (4,300 m). The lowest and highest points in the contiguous United States are in the state of California, and only about 84 miles (135 km) apart. At an elevation of 20,310 feet (6,190.5 m), Alaska's Denali (Mount McKinley) is the highest peak in the country and North America. Active volcanoes are common throughout Alaska's Alexander and Aleutian Islands, and Hawaii consists of volcanic islands. The supervolcano underlying Yellowstone National Park in the Rockies is the continent's largest volcanic feature. The United States has the most ecoregions out of any country in the world.
Cape Cod, Edgewood Circle, Chatham, Barnstable County, Massachusetts, 02669, United States (41.79881 -69.99601)
Coordinates: 41.51507 -70.68759 42.08253 -69.92879 - Minimum elevation: -14 ft - Maximum elevation: 381 ft - Average elevation: 20 ft
Hilton Head Island, Beaufort County, South Carolina, United States (32.16185 -80.75126)
Coordinates: 32.10723 -80.83152 32.27632 -80.65802 - Minimum elevation: -7 ft - Maximum elevation: 102 ft - Average elevation: 13 ft