Explore details about location A Antofagasta. A Antofagasta is a location situated within the Mejillones alongside other areas such as Iquique - Río Loa - Taltal - Cruce Ruta 5 (Las Breas), Sector: Río Loa - Antofagasta, Autopista Antofagasta - Mejillones, Mejillones - Compañía Fertilizantes.