Old Faithful, Riverside, and Grand Geysers

The Upper Geyser Basin in Yellowstone National Park, Wyoming, has the largest concentration of geysers and other geothermal features in the world, including Old Faithful, Riverside Geyser, Grand Geyser, and Morning Glory Pool.

John Coulter sent back the first published account ...

Midway Geyser and Grand Prismatic Spring

The Midway Geyser Basin is located in Yellowstone National Park, and is part of the largest collection of geysers in the world. Midway features the Excelsior Geyser, which discharges more than 4,000 gallons of water per minute, as well as ...

Grand Geyser

An eruption of Grand Geyser, the tallest predictable geyser in the world, occurs every 7 - 15 hours. A classic fountain geyser, Grand erupts from a large pool with powerful bursts rather than a steady column like Old Faithful. An ...