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The three largest Brazilian watersheds and their hydroelectric potentials (Agência Nacional de Aguas 2013 and Empresa de Pesquisa Energética 2015)
| Basin | Total area (km2) | Hydroelectric potential (MW) | Percentage of total hydroelectric potential in the Amazon |
| Madeira | 548,960 | 14,700 | 19 |
| Xingu | 509,685 | 22,795 | 30 |
| Tapajos | 492,263 | 24,626 | 32 |
