Normally, it is divided at the [[Suez Canal]] into Eurasia and Africa, the former of which can be subdivided into [[Europe]] and [[Asia]]. It can be divided alternatively into Eurasia-[[North Africa]] and [[Subsahara]] for cultural and historical reasons.<ref>{{Citation
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Normally, it is divided at the [[Suez Canal]] into Eurasia and Africa, the former of which can be subdivided into [[Europe]] and [[Asia]]. It can be divided alternatively into Eurasia-[[North Africa]] and [[Subsahara]] for cultural and historical reasons.<ref>{{Cite
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| last=Diamond
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| author=Jared Diamond
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| first=Jared
| author-link=Jared Diamond
| author-link=Jared Diamond
| title=[[Guns, Germs, and Steel]]: The Fates of Human Societies
| title=[[Guns, Germs, and Steel]]: The Fates of Human Societies