Last updated: June 4, 2021
Upper Geyser Basin - Orientation West of Old Faithful
The majority of world's active geysers are in the Upper Geyser Basin, including Old Faithful. Only four other locations in the world have large concentrations of hydrothermal features: Russia (Kamchatka), Chile, New Zealand, and Iceland.
The heat for the hydrothermal features comes from Yellowstone's volcano. Molten rock or magma may be as close as 3-8 miles (5-13 km) under ground. Rain and snow supply water that seeps downs several thousand feet (more than a kilometer) below the surface where it is heated.
Underground cracks form the third ingredient: a natural "plumbing" system. Hot water rises through the plumbing to produce hot springs and geysers.
Rangers forecast the eruption times of five geysers here: Old Faithful, Castle, Grand, Daisy, and Riverside.
Use Caution in Thermal Areas
- Stay on boardwalks and trails.
- Thermal water can severely burn you.
- Never run, push, or shove.
- Supervise children at all times.
**You are responsible for your safety.**
**Think Safety, Act Safely. Yellowstone is a Dangerous Place.**
Wheelchair-accessible walkways lead from all parking areas to Old Faithful Geyser, and from the visitor center to other hydrothermal features.