Grand Geyser

Grand Geyser is located in the Upper Geyser Basin within Yellowstone National Park in Wyoming. It sits just across the Firehole River from the more famous Old Faithful geyser.

Grand Geyser is capable of blasting water up to 200 feet (60 meters) high into the air. This impressive height makes it recognized as the tallest predictable geyser in the world.

While it is predictable, the interval between eruptions generally ranges from 7 to 15 hours depending on the duration of the previous eruption. Park rangers usually provide an updated prediction window at the visitor center based on the geyser's recent activity.

It is classified as a fountain-type geyser, meaning it erupts in a series of powerful bursts from a pool of water. This contrasts with cone-type geysers like Old Faithful, which erupt as a steady, narrow stream.