border countries: Algeria 956 km, Benin 266 km, Burkina Faso 628 km, Chad 1,175 km, Libya 354 km, Mali 821 km, Nigeria 1,497 km
Coastline:
0 km (landlocked)
Maritime claims:
none (landlocked)
Climate:
desert; mostly hot, dry, dusty; tropical in extreme south
Terrain:
predominately desert plains and sand dunes; flat to rolling plains in south; hills in north
Elevation extremes: