According to Wikipedia, Yellowstone National Park is located "largely in the northwest corner of Wyoming and extending into Montana and Idaho." Established in 1872, it was the first national park in the USA and is widely held to be the first national park in the world. One of its most popular attractions is Old Faithful, a geyser that's renowned for the regularity of its eruptions, which since the year 2000 have occurred at intervals varying from 44 minutes to two hours.
© Haydn Thompson 2020