Located in the Yellow Stone National Park, Grand Prismatic Spring is the USA's largest source of hot springs. It is the third largest hot spring in the world. Some geologists working in the Hyden Geological Survey discovered Grand Prismatic Spring in 1871. They named it so due to the vibrant colors and since it has all the colors of the rainbow. Although, there are records of a few European explorers and a group of fur trappers of the American Fur Company having discovered it 1839. They named it The Boiling Lake. The diameter of the Grand Prismatic Spring is of 90 meters and has a 50 foot water geyser which is now called as Excelsior
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