In the 1870s, explorers in Yellowstone National Park witnessed a geyser that erupted like clockwork and gave it a name that still defines Yellowstone today

Yellowstone's Old Faithful geyser is a rare geological feature. Explorers named it in 1870 for its remarkably regular eruptions. Underground heat, water, and a special plumbing system create these spectacles. Earthquakes and rainfall have slightly altered its eruption intervals over time. Its reliability makes Old Faithful Yellowstone's most famous natural symbol.

In the 1870s, explorers in Yellowstone National Park witnessed a geyser that erupted like clockwork and gave it a name that still defines Yellowstone today
Yellowstone's Old Faithful geyser is a rare geological feature. Explorers named it in 1870 for its remarkably regular eruptions. Underground heat, water, and a special plumbing system create these spectacles. Earthquakes and rainfall have slightly altered its eruption intervals over time. Its reliability makes Old Faithful Yellowstone's most famous natural symbol.