Ninety-three percent of it is gone. The Atlantic Forest once blanketed Brazil's eastern coast from the equatorial north to the subtropical south, a continuous canopy stretching more than 3,000 kilometers. Five centuries of agriculture, logging, urbanization, and industrial expansion have reduced it to fragments. What remains holds 171 of Brazil's 202 threatened species, including golden lion tamarins and woolly spider monkeys, animals that exist nowhere else on Earth. In 1991, Brazil drew a line on the map and called these fragments a biosphere reserve. It became the largest forested biosphere reserve in the world -- not because the forest is vast, but because the effort to save it had to be.
The event that forced action came in 1985. On the slopes of the Serra do Mar, the mountain range that runs along Brazil's southeastern coast, catastrophic landslides tore through deforested hillsides above Cubatao, one of the most polluted industrial cities in the world at the time. The connection was direct: pollution from Cubatao's petrochemical plants had killed the forest on the slopes above, and without tree roots to hold the soil, the mountains came apart in the rain. The disaster made visible what ecologists had warned about for years. Deforestation was not just destroying habitat. It was undermining the physical stability of the landscape. Three years later, Brazil's 1988 constitution declared the Atlantic Forest national patrimony, a designation that carried legal weight. By 1991, the first boundaries of what would become the Atlantic Forest Biosphere Reserve were drawn around fragments of forest in Rio de Janeiro, Sao Paulo, and Parana.
The reserve today is enormous in scope but scattered in reality. As of 2011, UNESCO reported a total area of roughly 29.5 million hectares, with core protected zones of about 4 million hectares, buffer zones of 12.6 million hectares, and transition areas of 12.8 million hectares. It spans 15 Brazilian states, from Ceara in the northeast to Rio Grande do Sul in the deep south, following the Serra Mantiqueira, Serra Geral, and Serra do Mar mountain ranges. More than 700 fully protected conservation units make up the core zones. But the reserve is not a single unbroken wilderness. It is a network of parks, biological stations, mangroves, and riparian corridors separated by cities, farms, and highways. One hundred and twenty million people live in the surrounding areas, which generate 70% of Brazil's GDP. The forest persists in the gaps between one of the most economically productive regions on the continent.
The biological richness of these remnants is staggering, given how little forest remains. Golden lion tamarins, their fur the color of a sunset, survive in a few pockets of lowland forest in Rio de Janeiro state. Woolly spider monkeys, the largest primates in the Americas, cling to existence at sites like the Caratinga Biological Station in Minas Gerais, sharing the forest with three other primate species and more than 200 rare birds. The forest itself is layered and diverse: moist subtropical canopies with Araucaria pines and Podocarpus trees give way to cerrado grasslands, mangrove swamps, and salt marsh scrublands along the coast. Itatiaia National Park, Brazil's oldest, protects high-altitude grasslands and cloud forests in the Serra da Mantiqueira. The Caraca Natural Park, a former seminary in Minas Gerais, has become famous for its maned wolves, which come to the seminary steps at dusk to be fed. Each fragment is its own ark, carrying species that depend entirely on its survival.
The reserve's strategy is connectivity. Since 2005, a project coordinated by the National Council of the Atlantic Forest Biosphere Reserve has worked to create protected-area mosaics along the Serra do Mar Ecological Corridor, linking isolated parks into larger functional landscapes. The Bocaina Mosaic, the Central Rio de Janeiro Atlantic Forest Mosaic, and the Mantiqueira Mosaic were formalized by Brazil's Ministry of the Environment in March 2007, each one integrating federal, state, municipal, and private conservation units under a shared management framework. Funding has come from the World Bank, the Inter-American Development Bank, Conservation International, the MacArthur Foundation, and the government of Japan. The approach is pragmatic rather than purist: traditional communities of indigenous people, quilombolas, and fishermen live within the buffer zones, and the management model treats them as partners rather than problems. The reserve was the first biosphere reserve in Brazil and was recognized by UNESCO's Man and the Biosphere Programme in 1993. Its survival depends on the idea that 120 million people and a remnant forest can share the same coastline.
The Atlantic Forest Biosphere Reserve stretches along nearly the entire Brazilian coast, from Ceara (approximately 3°S) to Rio Grande do Sul (approximately 34°S). The reference coordinates of 24.17°S, 48.00°W place it in the Serra do Mar region of Sao Paulo / Parana, where the forested mountains rise sharply from the coastal plain. From altitude, the contrast between the dark green forested slopes of the Serra do Mar and the developed coastal strip is dramatic. Key airports along the reserve's extent include Sao Paulo/Guarulhos (SBGR), Rio de Janeiro/Galeao (SBGL), Curitiba (SBCT), and Florianopolis (SBFL). The Serra do Mar escarpment, often wreathed in clouds, is a prominent visual feature running parallel to the coast.