Antofagasta is grounded on rocky ground, hard and tough.
Over this layer is a dense soil with sand and medium-sized rock fragments where there are remains of abundant minerals.
According to the general classification of soils, Antofagasta is founded on clay loam soils of the type I and II.

The city has an irregular geomorphology by the presence of steep hills (400–500 m) that are part of Chilean Coast Range, in its eastern edge, and the Pacific Ocean to the west.
The formation of the rock mass, it makes the shoreline slope is very steep (Coloso, south of Antofagasta).
The coastal edge of the city has volcanic sediments, in contrast to the formation of hills of sand.
Stresses in the sea a rock formation called La Portada.

Among the most important mountains of the geography of the town of Antofagasta is the Cerro El Ancla (1.007 m), el Cerro Chato (485 m), Cerro Moño (4.830 m), Cerro Coloso (938 m), Cerro Bolfín (961 m), Cerro Jarón (988 m), Cerro Alcalde Poblete (979 m), Cerro Gordo (668 m), Cerro Fortuna (963 m) and Cerro Moreno (1.290 m).

In the coastal area, the commune has two portions island called Isla Guamán (located in front of Caleta La Chimba, 23°33'00"S latitude and 70°25'00"W longitude) and Isla Santa María (located in front of Caleta Constitución, 23°26'00"S latitude and 70°37'00"W longitude).
Antofagasta is grounded on rocky ground, hard and tough. Over this layer is a dense soil with sand and medium-sized rock fragments where there are remains of abundant minerals. According to the general classification of soils, Antofagasta is founded on clay loam soils of the type I and II.
The city has an irregular geomorphology by the presence of steep hills (400–500 m) that are part of Chilean Coast Range, in its eastern edge, and the Pacific Ocean to the west. The formation of the rock mass, it makes the shoreline slope is very steep (Coloso, south of Antofagasta). The coastal edge of the city has volcanic sediments, in contrast to the formation of hills of sand. Stresses in the sea a rock formation called La Portada.
Among the most important mountains of the geography of the town of Antofagasta is the Cerro El Ancla (1.007 m), el Cerro Chato (485 m), Cerro Moño (4.830 m), Cerro Coloso (938 m), Cerro Bolfín (961 m), Cerro Jarón (988 m), Cerro Alcalde Poblete (979 m), Cerro Gordo (668 m), Cerro Fortuna (963 m) and Cerro Moreno (1.290 m).
In the coastal area, the commune has two portions island called Isla Guamán (located in front of Caleta La Chimba, 23°33'00"S latitude and 70°25'00"W longitude) and Isla Santa María (located in front of Caleta Constitución, 23°26'00"S latitude and 70°37'00"W longitude).
Antofagasta