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West Yellowstone, Montana
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Located in the Midway Geyser Basin, the Grand Prismatic Spring measures approximately 370 feet in diameter and is renowned for its vibrant colors.
The spring's striking colors are due to microbial mats around the edges, which change hue with the water temperature.
In the late 19th century, Excelsior Geyser erupted with such force that it could shoot water up to 300 feet into the air.
The basin sits atop a volcanic hotspot, which fuels its geysers and hot springs, making it a dynamic and ever-changing landscape.
This caldera is one of the largest active volcanic systems in the world, formed by a massive eruption over 640,000 years ago.
The name comes from its location, roughly midway between the Upper and Lower Geyser Basins in Yellowstone National Park.
This stunning hot spring is known for its clear, blue waters and is a popular spot for visitors to admire.
In the late 1800s, early explorers and tourists were drawn to the basin's geothermal wonders, despite the challenging terrain.
As part of Yellowstone National Park, it is protected under federal law to preserve its unique geothermal features and ecosystems.
