Britain's United Nations ambassador has handed a baton to his Brazilian counterpart, whose country will host the games in Rio in 2016.
UN secretary general Ban Ki-moon recalled running in London's torch relay last year and said he was happy to witness last night's passing of the baton.
He said: "The great relay that symbolises our common goals and values and our commitment to use the games as a platform to promote mutual understanding and peace".
Ambassador Sir Mark Lyall Grant said International Inspiration, London 2012's international sports legacy programme, had "enriched the lives of more than 11 million children in 20 countries" through physical education, sport and play.
Brazil's UN ambassador Luiz Alberto Figueiredo Machado said Rio would promote sustainable development at the 2016 Olympics.