Caldera is a port city and commune in the Copiapo Province of the Atacama Region in northern Chile. It has an excellent harbor, protected by breakwaters, being the port city for the productive mining district centering on Copiapo to which it is connected by the first railroad constructed in Chile.
Caldera lies about 75 km (47 mi) west of Copiapo at the Pacific. The climate is very dry and hot, because of its location on the Atacama desert's coast. However, lately the climate has become colder due to the climatic change. The commune spans an area of 4,666.6 km2 (1,802 sq mi).