<Tr> <Th> Countries </Th> <Td> Brazil, Colombia, Peru </Td> </Tr> <Tr> <Td_colspan="2"> Tributaries </Td> </Tr> <Tr> <Td> - left </Td> <Td> Marañón, Japurá / Caquetá, Rio Negro / Guainía, Putumayo </Td> </Tr> <Tr> <Td> - right </Td> <Td> Ucayali, Purús, Madeira, Tapajós, Xingu </Td> </Tr>

Where did the amazon river get its name