| [drought and malaria decrease in the niayes area of senegal]. | the niayes is geographically characterized by an alternating succession of sand dunes and wet depressions, 20 km wide, which are behind the offshore bars from saint-louis to dakar. since 1970, the area has been affected by drought. the rainfall which was around 700 mm per year before 1960 has fallen below 500 mm during the last 30 years. in 1991 it was only 350 mm and in 1992, 260 mm. the vegetation has become impoverished in the depressions which are now more and more cultivated for vegetables. ... | 1995 | 8777544 |