The Phlegraean Fields is a large volcanic area located near Naples, Italy. It is known for its numerous craters, hot springs, and fumaroles, which release steam and gases from the Earth's interior. This region is a caldera formed by a supervolcanic eruption, making it one of the most significant volcanic sites in the world. The area is rich in history and mythology, often associated with the myth of Hercules and the battle between gods and giants. Today, the Phlegraean Fields is a popular destination for tourists and researchers interested in geology, volcanology, and ancient Roman history.