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| | Serra do Mar/Planeta.com |
 | | The Serra is under immense pressure from the population centres of Sao Paulo, Rio de Janeiro, Curitiba, as well as from the development of mass tourism, farming, deforestation, poaching and palmito (palm heart) thieves. |
 | | These areas are still subject to the ravages of developers, archaic land registration, and simple ignorance of the law, but the Serra still contains large tracts of virgin forest, often connected by trails used by the local population, varying in hiking time from a few hours to several days. |
 | | The one exception to this is the Upper Ribeira valley, home to Brazil's highest concentration of limestone caves, formed by the sea bed that was pushed up by the mountains, and the continual downpour it receives. |
| www.planeta.com /planeta/98/0898brazil.html (3834 words) |
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