SUB-SAHARAN AFRICA	NORTH AFRICA
Physical Criteria	Physical Criteria
greater variety	more dry
Sahara desert provides a large, strong, sparsely populated border	Sahara desert provides a large, strong, sparsely populated border
Cultural Criteria	Cultural Criteria
great variety of languages (1/3 of all languages are in Africa)	Mostly Arabic
predominately Christian and local religions	Mostly Islam
predominately Black African	predominately Caucasian
political criteria not useful since realm boundary cuts through several countries	political criteria not useful since realm boundary cuts through several countries
Economic Criteria	Economic Criteria
subsistence agriculture	nomadic herding
shifting cultivation	subsistence agriculture
|	oil
Historical Criteria	Historical Criteria
West African culture hearth	Nile River culture hearth
|	part of Ottoman Empire
European colonization occurred in both realms	European colonization occurred in both realms