Yellowstone National Park, set aside as a national park on March
1, 1872, is located mostly in the U.S. state of Wyoming, though it
also extends into Montana and Idaho. The park was the first of its
kind, and is known for its wildlife and geothermal features,
especially Old Faithful Geyser, one of the most popular areas in
the park.
Aboriginal Americans have lived in the Yellowstone region for at
least 11,000 years. The region was bypassed during the Lewis and
Clark Expedition in the early 1800s. Aside from visits by
mountain men during the early to mid-1800s, organized
exploration did not begin until the late 1860s. The U.S. Army was
commissioned to oversee the park just after its establishment. In
1917, administration of the park was transferred to the National
Park Service, which had been created the previous year. 
Hundreds of structures have been built and are protected for their
architectural and historical significance, and researchers have
examined more than 1,000 archaeological sites.
Yellowstone National Park spans an area of 3,472 square miles
(8,987 kmē), comprising lakes, canyons, rivers and mountain
ranges. Yellowstone Lake is one of the largest high-altitude
lakes in North America and is centered over the Yellowstone
Caldera, the largest supervolcano on the continent. The caldera is
considered an active volcano; it has erupted with tremendous
force several times in the last two million years. Half of the
world's geothermal features are in Yellowstone, fueled by this
ongoing volcanism.[3] Lava flows and rocks from volcanic
eruptions cover most of the land area of Yellowstone. The park is
the centerpiece of the Greater Yellowstone Ecosystem, the largest
remaining, nearly-intact ecosystem in the Earth's northern
temperate zone.[4]
Hundreds of species of mammals, birds, fish and reptiles have
been documented, including several that are either endangered or
threatened.[1] The vast forests and grasslands also include unique
species of plants. Grizzlies, wolves, and free-ranging herds of
bison and elk live in the park. Forest fires occur in the park each
year; in the large forest fires of 1988, nearly one third of the park
burned. Yellowstone has numerous recreational opportunities,
including hiking, camping, boating, fishing and sightseeing. Paved
roads provide close access to the major geothermal areas as well
as some of the lakes and waterfalls. During the winter, visitors
often access the park by way of guided tours that use either snow
coaches or snowmobile.
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