|Nuba Mountains, Sudan|
The Kadu, Kadugli–Krongo, or Tumtum languages are a small language family, once included in Kordofanian but since Thilo Schadeberg (1981) widely seen as Nilo-Saharan. However, there is little evidence, and a conservative classification would treat them as an independent family. There are three branches:
- Gerrit Dimmendaal, 2008. "Language Ecology and Linguistic Diversity on the African Continent", Language and Linguistics Compass 2/5:843ff.
- Thilo C. Schadeberg. 1981. "The classification of the Kadugli language group". Nilo-Saharan, ed. by T. C. Schadeberg and M. Lionel Bender, pp. 291–305. Dordrecht: Foris Publications.
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