Where is the world’s largest geothermal field located?

The world’s largest geothermal field is located in Yellowstone National Park, mainly in the U.S. state of Wyoming. The park sits atop a massive volcanic system that fuels geysers, hot springs, fumaroles, and mud pots. Yellowstone contains more than 10,000 hydrothermal features, making it the greatest concentration of geysers on Earth. Old Faithful is the best-known geyser, but the broader geothermal system is far larger than any single feature. The park's volcanism is driven by a hotspot beneath the North American plate.