A national park in Wyoming, famous for its spectacular geysers, hot springs, and other geothermal features.
America's oldest national park, Yellowstone covers nearly 3,500 square miles (9,000 square km) of forest, grassland, mountains, lakes, and canyons. It contains the greatest concentration of geothermal features in the world, including geysers, colorful hot springs, and mud pools.
Yellowstone's geothermal activity results from the fact that part of the area rests above a huge underground chamber of magma, which serves as a constant heat source. The features are arranged in distinct areas called geyser basins. Upper Geyser Basin contains around 150 geysers, including the famous Old Faithful, and several colorful springs. Many of the geysers erupt more than 100 ft (30 m) into the air. Plentiful rainfall seeps through Earth's crust and is heated by the magma chamber, providing a continuous hot water supply for the springs and geysers.
Rugged mountain scenery, deep glacier-carved valleys, waterfalls, canyons, and rich wildlife are among other interesting features of Yellowstone. The Grand Canyon of Yellowstone, as well as two waterfalls on the Yellowstone River, constitute some of its most dramatic attractions. Considered the world's largest intact ecosystem in the northern temperate region, Yellowstone is home to many large mammals such as American bison, wolves, black and grizzly bears, and moose.