Argentines have been voting to choose a new president to replace Cristina Fernandez de Kirchner, who is constitutionally barred from seeking a third term.
Ms Fernandez, who stands down after eight years in power, says she leaves Argentinia a better country.
Long queues formed outside polling stations from the early hours of Sunday.
Her hand-picked successor, left-winger Daniel Scioli, led opinion polls, he is facing a strong challenge from the centre-right mayor of Buenos Aires, Mauricio Macri.
Argentina's president says she is leaving behind "a country that is absolutely normal" and with "full employment." https://t.co/ONQf5oUxJX— Taos Turner (@taos) October 25, 2015