Located in the Ferlo, northern region of Senegal, the area studied by the OHM.I Tessékéré is characteristic of the African Sahel. This large area of bioclimatic transition between the Saharan area north and south Sudan savanna is characteristic consecutive ecological and human crises to drought events affecting Africa for several decades.
The region covered by the Observatory presents all the traits specific to Sahel (rainfall deficit, human pressure on the environment, modification of the environmental equilibrium) and the distinction of being the heart of a major pan-African program development and reforestation called Great Green Wall.