San Antonio is a Chilean city, commune and the capital of the San Antonio Province in the Valparaíso Region. It is the hub of the fishing area that spans the Chilean coast from Rocas de Santo Domingo to Cartagena. Its port is the largest in terms of freight handled and the busiest in the western coast of South America.GeographyThe city lies on hills and coastal dunes, immediately north of the mouth of the Maipo River and is crossed in two sections by estuaries, of Arévalo to the north and of El Sauce in the section of Llolleo.The city is located at 33°35′S and 71°37′W. It is bordered on the north by the commune of Cartagena; on the east, by the commune of Melipilla and the Maipo River; on the south, by the same river and by the communes of Santo Domingo and San Pedro; and on the west, by the Pacific Ocean (here termed "el mar Chileno", "the Chilean sea").It comprises an area of 502.5sqkm.ClimateSan Antonio enjoys a Mediterranean climate with coastal influences. The average annual temperature is with averages of in January and in July. Annual precipitation of 570mm is concentrated in June, with an average of 134mm.