The uninterrupted relay along Buenos Aires' streets and docks contrasted with the chaos over the last week in San Francisco, London and Paris where protesters tried to snuff out the flame and organizers extinguished or hid the torch to keep it safe.
The torch, touring the world ahead of the Olympic Games in Beijing in August, has drawn protests over China's policies, in particular its crackdown last month on unrest in Tibet.
In Buenos Aires, the biggest crowds gathered to watch the torch pass the city's obelisk monument. Enthusiastic on-lookers taking pictures with their cellphone cameras outnumbered activists protesting China's rule of Tibet.
Police kept small groups of pro- and anti-China protesters apart where they gathered in front of Argentina's pink presidential palace and at other points along the 13.8km route.
