Caldera is a city located in Chile. While the provided source material does not contain specific geographical details regarding its location within the country or its local landmarks, it defines the geological term "caldera" as a large cauldron-like hollow formed by volcanic activity.
A caldera is created when a magma chamber empties during an eruption, causing the overlying ground to collapse into the void. Unlike craters formed by explosions or impacts, calderas are types of sinkholes resulting from subsidence. These features can reach diameters of dozens of kilometers and are considered rare geological events.