The Atacama Region is one of Chile's 15 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 east with Provinces of Catamarca, La Rioja and San Juan of Argentina, and to west with the Pacific Ocean. The regional capital Copiapó is located at 806 km (501 mi) north of the country's capital of Santiago.
The Atacama Region is the third least populated region of the country, after Aysen and Magallanes. Of its total population, over 50% are located in the cities of Copiapó and Vallenar.