Which national park contains the world’s largest concentration of geysers, including Old Faithful?

Yellowstone National Park contains the world’s largest concentration of geysers, including Old Faithful.

Yellowstone lies mainly in Wyoming, with smaller sections in Montana and Idaho. Its hydrothermal features are powered by a large volcanic system beneath the park, where heat warms groundwater and creates geysers, hot springs, mudpots, and fumaroles.

The park contains the vast majority of the world’s active geysers. Old Faithful is its most famous, not because it is the largest geyser, but because its eruptions have historically been comparatively predictable. Eruption intervals vary, and predictions are based on recent observations.

Yellowstone became the world’s first national park in 1872. Its landscape also includes mountains, forests, deep canyons, and major rivers. The park is part of the Greater Yellowstone Ecosystem, a large region supporting species such as bison, elk, grizzly bears, and wolves.