<Tr> <Td> Mekong River </Td> <Td> Primary river </Td> <Td> Asia </Td> <Td> Pacific Ocean </Td> <Td> 805,604 </Td> <Td> 311,045 </Td> <Td> </Td> </Tr> <Tr> <Td> Jubba - Shebelle basin </Td> <Td> Primary river </Td> <Td> Africa </Td> <Td> Indian Ocean </Td> <Td> 805,100 </Td> <Td> 310,900 </Td> <Td> </Td> </Tr> <Tr> <Td> Great Lakes </Td> <Td> Lake </Td> <Td> North America </Td> <Td> St. Lawrence River </Td> <Td> 800,114 </Td> <Td> 308,926 </Td> <Td> </Td> </Tr> <Tr> <Td> Danube River </Td> <Td> Primary river </Td> <Td> Europe </Td> <Td> Black Sea </Td> <Td> 795,656 </Td> <Td> 307,204 </Td> <Td> </Td> </Tr>

What is the largest drainage basin in canada