I little bit warmer at this time of the year. 
http://brasilride.com.br/site/Home?en
From the site, about the race:
Claro Brazil innovates the ultra marathon in Brazil
The mountain bikers have months of preparation for the biggest challenge already done in Brazilian ground. Among mountains range, valleys, and rivers Chapada Diamantina cross-country, in the center of Brazil is the perfect scenery for the six days epic race. From 14 to 19 November 2010, hundreds of athletes will have an unforgettable life experience in Claro Brazil Ride.
The structure, compared only to the biggest ultra marathons of the world, will provide everything that is necessary – water, food, accommodation, technical support , while they care only about they most like to do, pedal. Each day of the competition will have in media 80 to 100 kilometers of the purest mountain bike by the ways open on the diamond mining of the eighteenth century.
The real challenger of this competition is not only to win, but the knowledge, live the sport, overcome limits and get the closer of nature that can be. Side by side, the lovers of sport and the stars of the MTB, national and worldwide, will hold this journey by the heart of Brazil. On the cross-country, at the dinner table, on the camp, the fraternization, the experience exchange with athletes will be one of the pillars of the event.
The stage is the Chapada Diamantina, a magic place where the scenery changes every moment. The National Park has 152 thousand hectares and attitude media between 800 and 1200 meters above sea level, with peaks until 2000 meters. Water brings life to the region, with several fountains, water falls, crystal lakes red-colored rivers, that feed an incredible diversity of fauna and flora.
Disputed always in pairs, Claro Brasil Ride will open in categories: Open, Mixed, Ladie and Master (none athlete less than 40 years old). “Begin searching your partner cause the vacancies are limited” warns the organizer and ultra marathon Mario Roma.
http://brasilride.com.br/site/Home?en
From the site, about the race:
Claro Brazil innovates the ultra marathon in Brazil
The mountain bikers have months of preparation for the biggest challenge already done in Brazilian ground. Among mountains range, valleys, and rivers Chapada Diamantina cross-country, in the center of Brazil is the perfect scenery for the six days epic race. From 14 to 19 November 2010, hundreds of athletes will have an unforgettable life experience in Claro Brazil Ride.
The structure, compared only to the biggest ultra marathons of the world, will provide everything that is necessary – water, food, accommodation, technical support , while they care only about they most like to do, pedal. Each day of the competition will have in media 80 to 100 kilometers of the purest mountain bike by the ways open on the diamond mining of the eighteenth century.
The real challenger of this competition is not only to win, but the knowledge, live the sport, overcome limits and get the closer of nature that can be. Side by side, the lovers of sport and the stars of the MTB, national and worldwide, will hold this journey by the heart of Brazil. On the cross-country, at the dinner table, on the camp, the fraternization, the experience exchange with athletes will be one of the pillars of the event.
The stage is the Chapada Diamantina, a magic place where the scenery changes every moment. The National Park has 152 thousand hectares and attitude media between 800 and 1200 meters above sea level, with peaks until 2000 meters. Water brings life to the region, with several fountains, water falls, crystal lakes red-colored rivers, that feed an incredible diversity of fauna and flora.
Disputed always in pairs, Claro Brasil Ride will open in categories: Open, Mixed, Ladie and Master (none athlete less than 40 years old). “Begin searching your partner cause the vacancies are limited” warns the organizer and ultra marathon Mario Roma.