The mosaic coordinates protection across units of very different types. Some are national parks - fully protected lands where extractive activity is prohibited. Others are sustainable development reserves where traditional residents have rights to use natural resources. Still others are extractive reserves, environmental protection areas, and state parks. The National System of Conservation Units - the Brazilian law known as SNUC - defines a mosaic as a collection of protected areas of the same or different categories that are near each other, adjoin each other, or overlap, and that should be managed as a whole. The Lower Rio Negro Mosaic is exactly that. It spans igapó (flooded forest on black water), terra firme forest (the permanently above-water uplands), campina and campinarana (the white-sand habitats), and the caatinga-igapó transition communities. That variety of habitats within one management framework is the point.

The population of the mosaic is diverse in ways that older conservation frameworks often failed to recognize. Traditional riparian communities - the ribeirinhos - have lived along these rivers for generations. Indigenous peoples hold territories adjoining and overlapping the protected areas; the Waimiri Atroari, whose territory participated in the mosaic's creation process, are one such group. Artisan fishers, small farmers, gatherers, forest workers, and crafts people share the landscape with people involved in tourism, extraction, business, and government. Traditional occupations include slash-and-burn agriculture, extraction of plants and animals for subsistence and sale, logging, hunting, crafts, and tourism. The local knowledge is not incidental to conservation - it is often the key to knowing what sustainable use of these forests actually looks like. Ecotourism, non-timber forest extraction, agroforestry, and regulated fishing all depend on people who have lived here long enough to know what the systems can bear.

The ecological context cannot be separated from the economic one. When the Brazilian government established the Manaus Free Trade Zone in the 1960s, it generated explosive population growth and economic development across the region. Workers came in numbers, and with them came pressure on forests, rivers, and indigenous lands. The social, economic, and environmental problems of that era persist today. When conservation units began to be created in the 1980s and 1990s, many were established without meaningful public consultation - boundaries drawn on maps in Brasília that cut through communities who had been fishing or farming those stretches for decades. The inevitable conflicts followed. Traditional residents organized. They claimed rights to access the natural resources and territories that were now inside protected boundaries. The mosaic approach emerged partly as a response - a way to coordinate protection with the people who were already there.

The proposal to create the Lower Rio Negro Mosaic was prepared by IPÊ - the Instituto de Pesquisas Ecológicas, the Institute of Ecological Research - and submitted in January 2005 to the Fundo Nacional do Meio Ambiente, the National Environment Fund. It took nearly six years from that submission to formal recognition. Various government agencies, non-governmental organizations, and civil society groups participated in developing the plan. The Waimiri Atroari Indigenous Territory participated in the process with the possibility of becoming one of the mosaic's components. When the Brazilian Ministry of the Environment formally recognized the mosaic in December 2010, it was one of a growing set of coordinated management frameworks designed to address the fact that the boundaries of any single protected area are usually not the boundaries of the ecosystems or the communities inside it.

The mosaic is part of the Central Amazon Biosphere Reserve and Ecological Corridor, the larger conservation framework that links Jaú National Park, Amanã Sustainable Development Reserve, Mamirauá Sustainable Development Reserve, and Anavilhanas National Park - all of which are parts of the Central Amazon Conservation Complex, itself a UNESCO World Heritage Site. Read on a map, the mosaic looks like overlapping pieces of a regional whole. On the ground it is the working framework by which federal, state, and civil institutions try to make decisions across units that might individually have different legal statuses, different management authorities, and different resident communities. The Lower Rio Negro Mosaic is not glamorous. It does not have a headline the way a new national park does. But the coordinating work it represents - how do you actually govern 7.4 million hectares with multiple publics and multiple legal regimes - is at the center of what modern conservation has to figure out.