Nigeria is located in West Africa, bordered by Cameroon to the
east, Niger to the north, Benin Republic to the west and the
Atlantic Ocean to the south. The terrain varies from coastal
swamps and tropical forest in the south, to savannah and semi-
desert in the north. Nigeria lies within latitudes 4.321N and 141N
and longitude 2.721E and 14.641E as shown in Fig. 1, with land area
of about 924,000 km2 and a population of 165 million [1,2].