Where is the largest active geyser in the world?

Steamboat Geyser, in Yellowstone National Park in Wyoming, is widely regarded as the world’s tallest active geyser. Its major eruptions can shoot water and steam more than 90 meters into the air, higher than Old Faithful’s famous blasts. Unlike many geysers, it is irregular and can go years between major eruptions. Yellowstone’s geothermal system exists because of the volcanic hotspot beneath the park. Steamboat has had several active periods in recent decades, including especially frequent eruptions in 2018 and 2019.