World's Tallest Geyser

Steamboat Geyser in Yellowstone National Park is the largest active geyser in the world, though not many people wait around long enough to witness it.  The Geyser can remain dormant for decades, but once it erupts, as it did in 2005- the water and steam can reach heights of 300 to 400 feet.  That's more than twice the size of Old Faithful, which is much more reliable.  How often does Old Faithful erupt?  It erupts over 15 times a day.  Old Faithful is located in Yellowstone National Park.