<P> Nigeria's most expansive topographical region is that of the valleys of the Niger and Benue River valleys (which merge into each other and form a "y" shaped confluence at Lokoja). Plains rise to the north of the valleys . To the southwest of the Niger there is "rugged" highland, and to the southeast of the Benue hills and mountains are found all the way to the border with Cameroon . Coastal plains are found in both the southwest and the southeast . </P> <Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (January 2011) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This section needs expansion . You can help by adding to it . (January 2011) </Td> </Tr> <P> The Niger Delta is located in the southern part of Nigeria . It is one of the world's largest arcuate fan - shaped river deltas . </P>

Impact of geography on the history of nigeria