Marked with a tall obelisk, this place is considered to be the geographical center of the South America.
Wikipedia (Portuguese) http://pt.wikipedia.org/wiki/Centro_Geod%C3%A9sico_da_Am%C3%A9rica_do_Sul
Address 2817 Rua Barão de Melgaço, Cuiabá 78055-312, Brazil
Coordinates -15°36'2.277" N -56°6'1.855" E