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Geisa Rafaela Arcanjo (born 19 September 1991, in São Roque, São Paulo) is a Brazilian athlete. She was a finalist at the 2012 Summer Olympics, finishing sixth. Her personal best for the event is 19.02 metres. She was the 2012 gold medallist at the Ibero-American Championships in Athletics. Arcanjo initially won at the 2010 World Junior Championships in Athletics, but was disqualified for doping.