Picture of the day

A composite relief satellite image of South America , the fourth-largest continent. South America occupies the southern portion of the landmass in the Western Hemisphere . The continent is generally delimited on the northwest by the Darien watershed along the Colombia ? Panama border. Almost all of mainland South America sits on the South American Plate , as do nearby outlying islands. Photo: Blue Marble by Reto Stockli, NASA / GSFC