The Atlas Mountains, located in North-Western Africa, serve as a critical geographical feature that separates the Mediterranean region from the Sahara Desert. This mountain range plays a significant role in influencing the climate and ecosystems of the area, affecting rainfall patterns and serving as a barrier for various biogeographical zones. Understanding such geographical formations is crucial for UPSC Prelims, as they impact socio-economic activities, biodiversity, and regional development, aligning with the syllabus which covers physical geography.