Central Africa

Cameroon
Religion: Indigenous beliefs 40%, Christian 40%, Muslim 20%
Languages: 24 major African language groups, English (official), French (official)
Links: The World Factbook
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Central African Republic
Religion: Indigenous beliefs 35%, Protestant 25%, Roman Catholic 25%, Muslim 15%
Languages: French (official), Sangho (lingua franca and national language), tribal languages
Links: The World Factbook
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Congo Brazzaville
Religion: Christian 50%, animist 48%, Muslim 2%
Languages: French (official), Lingala and Monokutuba (lingua franca trade languages), many local languages and dialects (of which Kikongo is the most widespread)
Links: The World Factbook
Democratic Republic of Congo (DRC)
Religion: Roman Catholic 50%, Protestant 20%, Kimbanguist 10%, Muslim 10%, other syncretic sects and indigenous beliefs 10%
Languages: French (official), Lingala (a lingua franca trade language), Kingwana (a dialect of Kiswahili or Swahili), Kikongo, Tshiluba
Links: The World Factbook
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Equatorial Guinea
Religion: Nominally Christian and predominantly Roman Catholic, pagan practices
Languages: Spanish (official), French (official), pidgin English, Fang, Bubi, Ibo
Links: The World Factbook
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Gabon
Religion: Christian 55%-75%, animist, Muslim less than 1%
Languages: French (official), Fang, Myene, Nzebi, Bapounou/Eschira, Bandjabi
Links: The World Factbook
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Sao Tome Principe
Religion: Christian 80% (Roman Catholic, Evangelical Protestant, Seventh-Day Adventist)
Languages: Portuguese (official)
Links: The World Factbook
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Basics of Life

"Over 250 million people -- half of sub-Saharan Africa's population -- have no access to safe drinking water, and almost 300 million lack adequate sanitation. If the current situation does not improve, an estimated 500 million Africans are likely to be without safe water and sanitation by the year 2020, given the rate of population growth." Source: http://www.un.org/ecosocdev/geninfo/afrec/vol11no2/special3.htm