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Sao Paulo airport, Brazil, satellite image. North is at top, urban areas are shown as pink. The runways of Sao Paulo airport are visible right of centre, whilst a map of greater Sao Paulo (top left) has a bounded area showing the position of the close-up within the city. Sao Paulo is the largest city in Brazil and, with a population of around 20 million, in 2005 is the second largest city in the world. The area of the city is around 1600 square kilometres. It is located 400 kilometres south-west of Rio de Janeiro. (KEYSTONE/SCIENCE PHOTO LIBRARY/PLANETOBSERVER)