What are the four main geographic regions of west Africa?

1. The Coast: This region is characterized by its long coastline, which stretches from Mauritania to Nigeria. The climate is tropical, with a hot, humid climate. The main economic activity is fishing, and the region is also home to several major ports, including Dakar and Abidjan.

2. The Sahel: This region is located just south of the Sahara Desert. The climate is semi-arid, with a long dry season and a short rainy season. The main economic activity is livestock herding, and the region is also home to several major cities, including Niamey and Ouagadougou.

3. The Sudan: This region is located between the Sahel and the Congo Basin. The climate is tropical, with a long rainy season and a short dry season. The main economic activity is agriculture, and the region is also home to several major cities, including Bamako and Conakry.

4. The Congo Basin: This region is located in central Africa. The climate is tropical, with a year-round rainy season. The main economic activity is agriculture, and the region is also home to several major cities, including Kinshasa and Brazzaville.