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Fog lingers among the forested hills of Great Smoky Mountains National Park, which spans the southern Appalachians along the border between <a href="http://travel.nationalgeographic.com/travel/united-states/tennessee-guide/" target="_blank">Tennessee</a> and <a href="http://travel.nationalgeographic.com/travel/united-states/north-carolina-guide/" target="_blank">North Carolina</a>. Water and hydrocarbons exuded by trees produce the filmy "smoke" that gives the mountains their name.</p>
Smoky Sunset
Fog lingers among the forested hills of Great Smoky Mountains National Park, which spans the southern Appalachians along the border between Tennessee and North Carolina. Water and hydrocarbons exuded by trees produce the filmy "smoke" that gives the mountains their name.
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Pictures: Great Smoky Mountains National Park
Straddling the North Carolina-Tennessee border, Great Smoky Mountains National Park attracts more than ten million visitors a year—more than any other U.S. national park.
