The natural arch "Portada de Antofagasta" is located about 18 kilometres in the north of the city Antofagasta. The arch is 43 m high, 23 m wide and 70 metres long. The arch is a symbol of the city of Antofagasta and was declared as a Natural Monument in 1990.
Chile 1959/1962, La Portada de Antofagasta.
Chile 2001, "75th Anniversary Rotary Club".
The natural arch "Portada de Antofagasta" is pictured bottom right.
Chile 2006, 50th Abbiversary of the Catholic University of the North.
The left stamp shows the natural arch "Portada de Antofagasta".
Chile 2010, La Portada de Antofagasta.
The stamp was issued in the miniaturesheet "Antofagasta – Saluda al Bicentenario".
La Portada is also depicted on the stamp "75 Years Carabineros de Chile".