This image shows the sprawling urban footprint of São Paulo, Brazil, South America’s largest city with roughly 17 million people. The different colors (pink, white, and gray) define different types and generations of streetlights. The port of Santos, on the right side of the photograph, is also well defined by lights.
Image Science and Analysis Laboratory, NASA-Johnson Space Center. 18 Mar. 2005. "Earth from Space - Image Information."