Biome Hydrographic region FEOW N
Amazonia Amazonian Amazonian estuary and costal drainages 27
Guiana Amazonian Shield 7
Amazonian lowlands 138
Madeira Brazilian Shield 21
Rio Negro 70
Tapajós Juruena 26
Xingu 7
Atlantic North/Northeast transect Amazonian estuary and costal drainages 17
Caatinga Atlantic North/Northeast transect Northeast Caatinga and costal drainages 17
São Francisco 1
São Francisco São Francisco 1
Cerrado Paraná Paraguay 6
Tocantins-Araguaia 2
Upper Paraná 100
São Francisco São Francisco 26
Tocantins Tocantins-Araguaia 54
Upper Paraná 2
Atlantic Forest Atlantic East Transect Fluminense 15
Paraíba do Sul 6
Atlantic Southeast Transect Laguna dos Patos 5
Ribeira de Iguape 11
Paraná Paraíba do Sul 1
Ribeira de Iguape 6
Upper Paraná 87
Total 653