L1 users: 44,900 (2000).
Sud-Kivu province: Mwenga territory.
Iyoko, Ibanda, Isopo, Lusenge, Bilembo-Mango, Mizulo. Speakers say Lega-Shabunda [lea] and Bembe [bmb] are difficult to understand. Lexical similarity: 96%–88% among dialects; 76%–84% with Bembe [bmb]; 67%–81% with Lega-Shabunda [lea]; 60% with Buyu [byi]; 50% with Zimba [zmb], Enya [gey], and Mituku [zmq]; 45% with Nyanga [nyj].
Also use Congo Swahili [swc], as the language of instruction in school.
Latin script [Latn], limited usage.