L1 users: 75,000 (2004 SIL). 30,000 Katcha and Kadugli (2004), 4,000 Miri.
Janub Kurdufan state. Katcha dialect: Katcha, Tuna, Kafina, Dabakaya (Donga), Belanya, and Farouq villages, south of Kadugli; Kadugli dialect: Kadugli, Murta, Kulba, ’Daalimo, Thappare and Takko villages; Miri dialect: Miri Bara, Miri Guwa, Umduiu, Nyimodu, Luba, Kadoda, Kya, Tulluk, Hayar al-Nimr, Kuduru, Kasari, and Sogolle villages, west of Kadugli.
Katcha (Dholubi, Tolubi), Kadugli (Dakalla, Dhalla, Kudugli, Morta, Talla, Toma Ma Dalla), Miri, Damba, Tumma. Stevenson (1984) treats them as dialects of one language. Ruhlen (1987) and Schadeberg (1989) treat them as separate. Samir Bulus says that Tumma is dialect of Katcha. Lexical similarity: 85% among Katcha, Kadugli, and Miri dialects, 88% between Kadugli and Damba.
Some young people, all adults. Also use Sudanese Spoken Arabic [apd].
Latin script [Latn].