Upper Geyser Basin

Member Rating 4 out of 5 by slabeaume on July 7, 2002

The Upper Geyser Basin is approximately two square miles in area. It contains the largest concentration and nearly one-quarter of all of the geysers in the world. A variety of thermal features exist here: spouting geysers, colorful hot springs, and steaming fumaroles. Only 3 other places in the world have large thermal features such as these (Iceland, New Zealand, and Siberia).

Geyser Hill is in the upper geyser basin and just north of Old Faithful. This is a very easy walk from Old Faithful Inn. There are over 40 geysers on geyser hill. Two of these, Giantess and Beehive are among the largest in the world.

Old Faithful is in the Upper basin. It is one of 5 predictable geysers. It is a cone-type geyser and erupts every 35 to 120 minutes. Its eruptions last from 1 1/2 to 5 minutes and reach a height of 90 to 184 feet.

Geysers are caused when the water is constricted from moving freely underground. The pressure increases until small bubbles of steam actually push heated water out in a forceful manner.

Upper Geyser Basin
by Old Faithful Inn
Yellowstone National Park, Wyoming


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