Yellowstone National Park is located in the western United States, mostly in the state of Wyoming. It was established in 1872 as the first national park in the world. The park covers an area of over 2 million acres and is home to a wide variety of wildlife, including grizzly bears, wolves, bison, and elk. It is also home to several famous geothermal features, such as Old Faithful, which erupts every 90 minutes. Yellowstone is a popular destination for outdoor enthusiasts who come to hike, camp, fish, and take in the stunning natural beauty of the area. With its diverse landscapes and unique geology, Yellowstone National Park offers visitors an unforgettable experience in the great outdoors.

https://www.nps.gov/yell/index.htm