Size: 923,768 square kilometers.
Boundaries: Southern limits set by Gulf of
(bights of Benin and Biafra); inland frontiers shared with
Cameroon (east), Chad (northeast), Niger (north), and
(west). No demarcation reached regarding
Cameroon boundary in Lake Chad, leading to disputes.
Topography: Five major geographic divisions: low
coastal zone along Gulf of Guinea; succeeded northward by
and low plateaus; Niger-Benue river valley; broad stepped
stretching to northern border with highest elevations over
meters; mountainous zone along eastern border, which
country's highest point (2,042 meters).
Climate: Tropical with variations governed by
interaction of moist southwest monsoon and dry northeast
Mean maximum temperatures of 30-32șC (south), 33-35șC
High humidity in south February-November, June-September
north; low humidity during dry season. Annual rainfall
northward; about 2,000 millimeters in coastal zone (Niger
averages over 3,550 millimeters); 500 to 750 millimeters
Data as of June 1991