Buenos Aires is an Autonomous City and is the capital and largest city of Argentina. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the country and South America. The name is Spanish and means fair winds, given to the place by the founders in the 16th century. There are no mines or caves, but some subterranea. The city has a subway, the Buenos Aires Underground with 100 stations, and 58.8 km of tracks.