The geography of Chile is extremely diverse, as the country extends from a latitude of 17° South to Cape Horn at 56° and from the Pacific Ocean at its west to the Andes at its east. Chile is situated in southern South America, bordering the South Pacific Ocean and a small part of the South Atlantic Ocean. Chile's territorial shape is considered among the world's most unusual; from north to south, the country extends , and yet it only averages east to west. Chile reaches from the middle of South America's west coast straight down to the southern tip of the continent, where it curves slightly eastward. Diego Ramírez Islands and Cape Horn, the southernmost points in the Americas, where the Pacific and Atlantic oceans meet, are Chilean territory. Chile's northern neighbors are Peru and Bolivia, and its border with Argentina to the east, at , is the world's third-longest. The total land size is . The very long coastline of gives Chile the 11th largest exclusive economic zone of .
Physical geography
The northern two-thirds of Chile lie on top of the telluric Nazca Plate, which, moving eastward about ten centimeters a year, is forcing its way under the continental plate of South America. This movement has resulted in the formation of the Peru–Chile Trench, which lies beyond a narrow band of coastal waters off the northern two-thirds of the country. The trench is about wide and averages about in depth. At its deepest point, just north of the port of Antofagasta, it plunges to . Although the ocean's surface obscures this fact, most of Chile lies at the edge of a profound precipice.
The same telluric displacements that created the Peru-Chile Trench make the country highly prone to earthquakes. During the twentieth century, Chile has been struck by twenty-eight major earthquakes, all with a force greater than 6.9 on the Richter scale. The strongest of these occurred in 2010 (registering an estimated 8.8 on the Richter scale) and in Valdivia 1960 (reaching 9.5). This latter earthquake occurred on May 22, the day after another major quake measuring 7.25 on the Richter scale, and covered an extensive section of south-central Chile. It caused a tsunami that decimated several fishing villages in the south and raised or lowered sections of the coast as much as two meters. The clash between the Earth's surface plates has also generated the Andes, a geologically young mountain range that, in Chilean territory alone, includes about 620 volcanoes, many of them active. Almost sixty of these had erupted in the twentieth century by the early 1990s. More than half of Chile's land surface is volcanic in origin.
About 80 percent of the land in Chile is made up of mountains of some form or other. Most Chileans live near or on these mountains. The snowcapped Andes and their pre-cordillera elevations provide an ever-present backdrop to much of the scenery, but there are other, albeit less formidable, mountains as well. Although they seemingly can appear anywhere, the non-Andean mountains usually form part of transverse and coastal ranges. The former, located most characteristically in the near north and the far north natural regions, extend with various shapes from the Andes to the ocean, creating valleys with an east-west direction. The latter are evident mainly in the center of the country and create what is commonly called the Central Valley (Valle Central) between them and the Andes. In the far south, the Central Valley runs into the ocean's waters. At this location, the higher elevations of the coastal range facing the Andes become a multiplicity of islands, forming an intricate labyrinth of channels and fjords that have been an enduring challenge to maritime navigators.
Much of Chile's coastline is rugged, with often violent surf which pounds against the rocks lying at the feet of high bluffs. This collision of land and sea gives way every so often to beaches of various lengths, some of them encased by the bluffs. The Humboldt Current, which originates northwest of the Antarctic Peninsula (which juts into the Bellingshausen Sea) and runs the full length of the Chilean coast, makes the water frigid. Swimming at Chile's popular beaches in the central part of the country, where the water gets no warmer than in the summer. A recent global remote sensing analysis suggested that there were 564km² of tidal flats in Chile, making it the 44th-ranked country in the world in terms of tidal flat area.