Biyanda (''Ɓìyàndà'') and Buli (''Ɓùlì'') constitute a

Gbaya language The Gbaya languages, also known as Gbaya–Manza–Ngbaka, are a family of perhaps a dozen languages spoken mainly in the western Central African Republic and across the border in Cameroon, with one language (Ngbaka) in the Democratic Republic o ...

of the Central African Republic. ''Ethnologue'' groups them as Southwest Gbaya, but it is not clear how many of the Southwest varieties are part of the same language; Toongo and Mbodomo, for example, are not closely related, though Toongo speakers identify ethnically as Buli, and ''Ethnologue'' also lists Mbodomo as a separate language.

References

Gbaya languages Languages of the Central African Republic {{gbaya-lang-stub