Old Faithful, Yellowstone National Park, Wyoming. "Old Faithful is a cone geyser located in Yellowstone National Park in Wyoming. It was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name. It is a highly predictable geothermal feature and has erupted every 44 to 125 minutes since 2000. It also reaches 106 feet to 185 feet in height, has a duration of
3 to 10 minutes and discharges 3,700 US gallons to 8,400 US gallons."