Largest concentration of geysers

According to Official Guinness Records,

According to UNESCO, Yellowstone National Park, which lies mostly within the
borders of Wyoming, USA, contains more than 10,000 geothermal features -
more than half of the world's known examples. The park's extensive, intact
ecosystem is home to thousands of hot springs, mudpots and fumeroles, and
boasts at least 300 geysers - two-thirds of the planet's total - with up
to 250 of those active. Geysers are hot springs of boiling water that erupt
periodically into the air as the underground steam expands up to 1,500 times
its normal volume.
Yellowstone was opened in 1872 and covers 9,000 km2 (3,475 miles2) of the
American west. It occupies Wyoming (97%), Montana (2%) and Idaho (1%).

For a complete list of 2011 records, please visit 2011 Guinness Records in United States.

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