Eurasia
Sometimes Eurasia is divided into West Eurasia and East Eurasia. Here, the dividing line is the Ural Mountains. West Eurasia includes Europe and the Middle East. Historians sometimes add North Africa to West Eurasia, because the Sahara Desert divides North Africa from Sub-Saharan Africa, and it is as difficult to cross as a sea. Also, North Africa is culturally linked to Europe by the Mediterranean Sea.