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Campi Flegrei, also known as the Phlegraean Fields, is a large wide caldera situated to the west of Naples, Italy. Today most of the area lies underwater, but it includes the town of Pozzuoli and the Solfatara crater, home of the Roman god of fire, Vulcan. It is thought that the caldera was created in 2 major events, the first occurred about 40,000 years ago and produced the Campanian Ignimbrite. At approximately 12,000 years ago another major eruption occurred forming a smaller caldera inside the main one, centered on the town of Pozzuoli. This event is known as the Neopolitan Yellow Tuff referring to the characteristic yellow rocks there.