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The Great Lakes define much of the border between the eastern United States and Canada.More fresh water inland seas than lakes, they were formed by the pressure of retreating glaciers at the end of the last Ice Age.
The Rockies are, on average, the highest in North America, extending from Alaska to New Mexico, with many areas designated as national parks that offer hiking, camping, skiing, and sightseeing opportunities.
The combined Sierra Nevada and Cascade ranges are the youngest.
The Sierras extend across the "backbone" of California, with sites such as Lake Tahoe and Yosemite National Park, then give way to the even younger volcanic Cascade range, with some of the highest points in the country.
It also has the world's third-largest population, with more than 320 million people.
It includes densely populated cities with sprawling suburbs and vast uninhabited areas of natural beauty.