What are the topographical in Sahel?

1. Semi-arid savanna: The Sahel is characterized by a semi-arid savanna landscape, with vast stretches of grasslands interspersed with scattered trees and shrubs. The vegetation is adapted to the region's low rainfall and high temperatures.

2. Undulating plains: The Sahel consists of gently undulating plains, with some areas featuring low-lying hills or rocky outcrops. The terrain is generally flat and suitable for agriculture and grazing.

3. Dune fields: In certain parts of the Sahel, particularly in the northern regions, there are extensive dune fields. These dunes are formed by the accumulation of windblown sand and can be several meters high.

4. Wadis and ephemeral rivers: The Sahel experiences seasonal rains, which give rise to ephemeral rivers and wadis (dry riverbeds). These watercourses fill up during the rainy season but quickly dry up during the long dry season.

5. Inselbergs and rock outcrops: In some areas, particularly in the southern Sahel, isolated hills or inselbergs rise abruptly from the surrounding plains. These are often remnants of more extensive rock formations that have been eroded over time.

6. Depressions and basins: The Sahel also contains several depressions and basins, such as the Lake Chad Basin in the central region. These basins are often associated with seasonal wetlands or permanent lakes.

7. Mountainous regions: Along the southern border of the Sahel, there are mountainous regions, such as the Fouta Djallon Highlands in Guinea and the Adamawa Plateau in Cameroon. These areas have higher elevations and receive more rainfall compared to the rest of the Sahel.

The topography of the Sahel region is diverse and includes a combination of gently rolling plains, dune fields, ephemeral rivers, inselbergs, depressions, and mountainous areas.