The Old Faithful is the nickname for the most famous geyser in the World.

It is located in the Yellowstone National Park (Wyoming, USA). It was named Old Faithful by the members of the expedition Washburn-Langford-Doane in 1870.

The Old Faithful eruptions can shoot 14.000-32.000 liters of boiling water to a height of 32-56 meters (106-185 f) and can last from 1.5 to 5 minutes.