<Tr> <Td> 04 </Td> <Td> As: Libya </Td> <Td> 4725000 </Td> <Td> 2008 est . </Td> <Td> Iran </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Af: Nigeria / Africa </Td> <Td> 2352000 </Td> <Td> 2011 est . </Td> <Td> Norway </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Af: Algeria </Td> <Td> 2173000 </Td> <Td> 2007 est . </Td> <Td> </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Af: Angola </Td> <Td> 1910000 </Td> <Td> 2008 est . </Td> <Td> </Td> </Tr>

Which of the following is not a major geophysical characteristic of subsaharan africa