Ephemeral Carnegie Lake, in Western Australia, fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh. When full, it can cover an area of about 6 square kilometers. In this Landsat 7 image from 1999, flooded areas appear dark blue or black. Vegetation appears in shades of dark and light green, and sands, soils, and minerals appear in a variety of colors.