West Africa is typically divided into several sub-regions, including:

1. *The Sahel*: A transitional zone between the Sahara Desert and the savannas to the south, covering parts of Mali, Burkina Faso, Niger, Chad, and Senegal.
2. *The Savannah*: A region of grasslands and open woodlands, covering parts of Senegal, The Gambia, Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Togo, Benin, and Nigeria.
3. *The Guinea Coast*: A region of coastal countries, including Guinea, Sierra Leone, Liberia, Côte d'Ivoire, Ghana, Togo, Benin, and Nigeria.
4. *The Niger Delta*: A region of dense vegetation and numerous waterways, covering parts of Nigeria, Cameroon, and Equatorial Guinea.

Some sources may also group West Africa into sub-regions based on cultural, linguistic, or historical ties, such as:

1. *The Mande region*: Covering parts of Mali, Guinea, Sierra Leone, Liberia, and Côte d'Ivoire.
2. *The Akan region*: Covering parts of Ghana, Côte d'Ivoire, and Togo.
3. *The Yoruba region*: Covering parts of Nigeria, Benin, and Togo.

Note that these sub-regions are not strictly defined and may overlap or have fuzzy boundaries.