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Buenos Aires at night 2011

Overview of Buenos Aires' 9 de Julio Avenue

Overview of Buenos Aires’ 9 de Julio Avenue with the Obelisk in the background, October 19, 2011. Buenos Aires is a classed as a megacity, those with a population of over 10 million people. The United Nations’ Department of Economic and Social Affairs said in a March 2010 report that by 2025, there will be 29 megacities globally, from 21 two years ago, with the majority in developing countries. The world’s population will reach seven billion on 31 October 2011. Picture taken October 19. REUTERS/Enrique Marcarian (ARGENTINA – Tags: CITYSPACE) – RTR2T7LD