The Nilo-Saharan languages reference article from the English Wikipedia on 24-Apr-2004
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Nilo-Saharan languages

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The Nilo-Saharan languages form a group of African Languages. In particular they are spoken in the upper parts of the Chari and Nile rivers, including Nubia. They include the Songhay languages.

More on Nilo-Saharan languages :
http://www.ethnologue.com/show_family.asp?subid=12