Yellowstone National Park is located primarily in Wyoming, although it also extends into Montana and Idaho, and was established by the U. S. Congress and signed into law by President Ulysses S. Grant on February 29, 1872. Yellowstone was the first National Park in the U.S. and is also widely held to be the first national park in the world. The park is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of its most popular features.
Yellowstone National Park spans an area of 3,468 square miles, comprising lakes, canyons, rivers and mountain ranges, Yellowstone Lake is one of the largest high-elevation lakes in North America and is centered over the Yellow Stone caldera, the largest supervolcano on the continent, and 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. Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone.
Hundreds of species of mammals, birds, fish and reptiles have been documented, including several that are either endangered or threatened. Grizzley bears, wolves, and free-ranging herds of bison and elk live in the park. The Park’s bison herd is the oldest and largest public bison herd in the United States. 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 snowmobiles. (from Wikipedia)