"All the construction work is on schedule," Rio Mayor Eduardo Paes told journalists in a nearly finished arena inside the giant Olympic Park building site.
"With 12 months left to complete the challenge, it's like "the end of a marathon," he said.
On August 5, 2016, the Olympic torch will end its own marathon -- being flown around the world and carried by 12,000 people through Brazil -- when it lights the flame inside the Maracana stadium for the opening ceremony.
There will be 206 countries represented -- the newest being recently recognized South Sudan -- and 10,500 athletes competing in 42 sports over 17 days. Right after, the Paralympics will see 4,350 athletes from 176 countries in 23 sports.
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To face the onslaught, Rio is assembling the equivalent of eight football fields of sporting gear -- "a million items," Nuzman said -- and 45,000 volunteer workers, with 25,000 on call for the Paralympics.
President Dilma Rousseff was to attend one-year ceremonies in Rio later Wednesday, along with the head of the International Olympic Committee, Thomas Bach.
"Thirty hours of flying and then one Brazilian caipirinha makes people tired," Paes quipped. "It was just one caipirinha," he quickly added.
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These will be the first Olympics held in South America and a chance for Brazil, the world's seventh largest economy, to look beyond a growing domestic brew of corruption and economic trouble.
Already the Olympic Park is 82 percent ready and Olympic Village 89 percent complete, Paes said.