<Tr> <Td> Area' </Td> </Tr> <Tr> <Td> Total </Td> <Td> 1,138,910 km (439,736 sq mi) </Td> </Tr> <Tr> <Td> Land </Td> <Td> 1,038,700 km (401,044 sq mi) </Td> </Tr> <Tr> <Td> Water </Td> <Td> 100,210 km (38,691 sq mi) </Td> </Tr>

What two landforms in south america limit the transportation and communication in the area