North Africa or Northern Africa is the northernmost region of the African continent, linked by the Sahara to Sub-Saharan Africa. Northern Africa includes the following seven countries Algeria, Egypt, Libya, Morocco, Sudan, Tunisia, Mauritania and Western Sahara. Egypt is northern Africa’s largest economy in terms of raw GDP. The chief revenue source for the region is oil, with Algeria head and shoulders above the rest. Algeria figures as one of Africa's wealthiest nations. The oil revenues and a small population give Libya one of the highest per capita GDPs in Africa. Agriculture still forms the base regions economy.