"Early morning of June 12 2014, one of the Expedition 40 crew members aboard the International Space Station (ISS) took this picture of Brazil ... Sao Paulo is the large cluster of night lights near the coast on the right side of the frame. Rio de Janeiro is the coastal city to the left of Sao Paulo. Belo Horizonte is the cluster of lights near frame center."
An amazing picture by Reid Wiseman (via Demografía - CSIC).
[click on the image to enlarge it]