According to this map, which area is at a very high risk of desertification?
the Sahara
the Kalahari Desert
the Sahel
the Congo River
![According to this map which area is at a very high risk of desertification the Sahara the Kalahari Desert the Sahelthe Congo River class=](https://us-static.z-dn.net/files/d0a/19f08ab83853fa8705082c3d22d997b4.jpg)