Caldera is a port city and commune in the Copiapó Province of the Atacama Region in northern Chile. It has a harbor protected by breakwaters, being the port city for the productive mining district centering on Copiapó to which it is connected by the first railroad constructed in Chile.

The Atacama Region is one of Chile's 16 first order administrative divisions. It comprises three provinces: Chañaral, Copiapó and Huasco. It is bordered to the north by Antofagasta, to the south by Coquimbo, to the east by the provinces of Catamarca, La Rioja and San Juan of Argentina, and to the west by the Pacific Ocean. The regional capital Copiapó is located 806 km (501 mi) north of the country's capital of Santiago. The region occupies the southern portion of the Atacama Desert, the rest of the desert is mainly distributed among the other regions of Norte Grande.