<Tr> <Th> Mayor </Th> <Td> Arthur Virgílio Neto (PSDB) </Td> </Tr> <Tr> <Th_colspan="2"> Area </Th> </Tr> <Tr> <Th> Municipality </Th> <Td> 11,401.06 km (4,401.97 sq mi) </Td> </Tr> <Tr> <Th> Urban </Th> <Td> 377 km (146 sq mi) </Td> </Tr>

Which of these cities is an important trading city located on the amazon river