ABSTRACT
the region of Central West Africa lying between approximately 10°N and 20°N. It includes the countries of Senegal, Mauritania, Mali, Burkina Faso, Niger and Chad. The Sahel is mostly desert margin and has suffered from a number of prolonged droughts in recent years. The Sahel countries of Africa https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315062624/81186797-f51e-44b6-9671-70ade4c1d40d/content/ufigs_1_C.jpg" xmlns:xlink="https://www.w3.org/1999/xlink"/>
