I'm unable to see the map you mentioned or the image associated with it. However, I can provide some general information about the landforms listed:
A. The Sahel - A semi-arid region that lies just south of the Sahara Desert. B. The Sahara Desert - The largest hot desert in the world, located in North Africa. C. The Nile River Valley - A fertile region along the Nile River, known for its agriculture. D. The Atlas Mountains - A mountain range in North Africa that stretches across Morocco, Algeria, and Tunisia.
Without the visual context of the map, I'm unable to determine which landform is located at oval B. If you can provide a description of oval B or any distinctive features visible on the map, I could help you further!