Wyoming is a western U.S. state defined by vast plains and the Rocky Mountains. Its famed Yellowstone National Park, a nearly 3,500-sq.-mile wilderness recreation area, is home to hundreds of animal species, dramatic canyons and alpine rivers. The park's gushing geysers include the iconic Old Faithful. To the south is Grand Teton National Park, known for backcountry skiing areas, forested trails and Snake River.

Source: en.wikipedia.org