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Yellowstone Caldera is a massive volcanic caldera located in Yellowstone National Park in the United States. It is a supervolcano that measures about 34 by 45 miles in size and is considered one of the largest active volcanic systems in the world. The caldera is characterized by its geothermal features such as geysers, hot springs, and mud pots, which are a result of the heat and pressure from the magma chamber beneath the surface. The Yellowstone Caldera has had several major eruptions in the past, with the most recent occurring around 640,000 years ago. Today, it is closely monitored by scientists for any signs of volcanic activity that could potentially impact the surrounding area.