Tourists pose for a photo while viewing the Iguazu Falls, one of the world's largest, from a catwalk on the Brazilian side of the Iguazu River that delimits the border with Argentina, six months after the worst drought in two decades dried the falls to a trickle, in Foz do Iguacu February 10, 2007. Picture taken on February 10, 2007. REUTERS/Jorge Adorno (BRAZIL)