Old Faithful, located in Yellowstone National Park, is one of the most predictable geysers in the world. It erupts approximately every 90 minutes, reaching heights of 100-180 feet. Its name reflects its reliability, which has fascinated visitors since its discovery in the late 19th century.

The geyser is powered by underground geothermal activity, where water and steam are expelled through a natural vent. Old Faithful is a cornerstone of Yellowstone’s ecosystem, showcasing the park’s dynamic geology. The area around the geyser is developed for tourism, with viewing platforms and educational displays.