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Jabiberi River
Jaboatão River
Jabotá River
Jaburu River
Jacaraípe River
Jacarandá River
Jacaré Pepira River
Jacaré River (Alagoas)
Jacaré River (Bahia, Das Contas River)
Jacaré River (Bahia, São Francisco River)
Jacaré River (Minas Gerais)
Jacaré River (Pará)
Jacaré River (Piquiri River)
Jacaré River (Purus River)
Jacaré River (Rio das Cinzas) (Jacarezinho River)
Jacaré River (Sergipe, Piauí River)
Jacaré River (Sergipe, São Francisco River)
Jacarecica River
Jacaré-Guaçu River
Jaciparaná River
Jacoca River (Paraíba)
Jacoca River (Sergipe)
Jacu River
Jacuba River
Jacuí River
Jacuí River (São Paulo)
Jacuí-Mirim River
Jacuípe River (Bahia)
Jacuípe River (Paraíba)
Jacuípe River (Pernambuco)
Jacuizinho River
Jacundá River (Pará)
Jacundá River (Rondônia)
Jacupiranga River
Jacuriaí River
Jacurutu River
Jacutinga River (Paraná)
Jacutinga River (Rio das Antas)
Jacutinga River (Uruguay River)
Da Jacutinga River
Jaguarão River
Jaguari Mirim River
Jaguari River (Canastra River)
Jaguari River (Ibicuí River)
Jaguari River (Paraíba do Sul)
Jaguari River (Piracicaba River)
Jaguariaíva River
Jaguariatu River
Jaguaribe River
Jaguarizinho River
Jagui River
Jaibaras River
Jamanxim River
Jamari River
Jamicia River
Jaminauá River
Jandiatuba River
Jangada River (Iguazu River)
Jangada River (Piquiri River)
Japaratuba River
Japoré River
Japuiba River
Japurá River
Jaquirana River
Jaracatiá River
Jararaca River
Jaraucu River
Jardim River (Distrito Federal)
Jardim River
Jari River (Purus River)
Jari River
Jaru River
Jataí River
Jatapu River
Jatobá River
Jatuarana River
Jaú River (Amazonas)
Jaú River (São Paulo)
Jauaperi River
Jauaru River
Jauquara River
Jauru River (Mato Grosso do Sul)
Jauru River (Mato Grosso)
Javary River
Jenipapo River
Jequiá River (Alagoas)
Jequiá River (Rio de Janeiro) (on Governador Island)
Jequié River
Jequiriçá River
Jequitaí River
Jequitinhonha River
Dos Jesuítas River
Ji-Paraná River (Machado River)
Jirituba River
João de Tiba River
João Leite River
João Paulo River
Jordão River (Acre)
Jordão River (Paraná)
Jorigue River
Juami River
Juari River
Juazeiro River
Juba River (Mato Grosso)
Jucá River
Jucu Braço Norte River
Jucu Braço Sul River
Jucu River
Jucurucu River
Jufari River
Juína River
Juína-Miriam River
Juininha River
Juma River (Brazil)
Jundiá River (Santa Catarina)
Jundiá River
Jundiaí River (Espírito Santo)
Jundiaí River (Rio Grande do Norte)
Jundiaí River (upper Tietê River)
Jundiaí River (São Paulo)
Jundiuvira River
Jupati River
Juqueri River
Juquiá River
Jurema River
Juriti River
Juruá River (Rondônia)
Juruá River
Juruá-Mirim River
Juruazinho River
Juruena River
Jurupari River
Jutai River
Jutaizinho River
Jutuva River
Kariniutu River
Kevuaieli River
Lacerda de Almeida River
Da Laguna River (Pauxis River)
Lajeado Grande River (Das Antas River)
Lajeado Grande River (Rio da Várzea)
Lajeado River (Maranhão)
Lajeado River (Paraná)
Lajeado River (Tocantins)
Lajeado Sertão
Das Lajes River
Ribeirão das Lajes
Lambari River (Pará River)
Lambedor River
Laranjaí River
Laranjal River
Laranjeiras River (Paraná)
Laranjeiras River (Santa Catarina)
Laranjinha River
Lava-Tudo River
Leão River
Do Leão River
Lençóis River
Leste River
Lever River (Itaberaí River)
Liberdade River (Juruá River)
Liberdade River (Xingu River)
Ligeiro River
Lôbo d'Almada River
Longá River
Lonqueador River
Lontra River
Ribeirão Lontra
Das Lontras River
Lourenço River
Lourenço Velho River
Luís Alves River
Luna River