Mali's most fertile agricultural area lies in the valley of this major west African river
... Mali 
lies within the intertropical zone and has a hot, dry climate, with the... [DOC] [TLE] Niger River | river, Africa | Britannica.com [PAR] With a length of 2600 miles (4200 km), it is the third longest river in Africa, after 
the ... Niger River, principal river of western Africa.