The term 'Yellowstone National PARK' is a 4-letter crossword solution referring to the first national PARK in the United States. Located primarily in Wyoming, Yellowstone National PARK is known for its geothermal features, including the famous Old Faithful geyser. The PARK is also home to a variety of wildlife, including grizzly bears, wolves, and bison. Established in 1872, Yellowstone National PARK is one of the most popular tourist destinations in the United States.