Mono language (Cameroon)
Mono is a moribund Mbum language spoken by older adults in northern Cameroon. Dama, a closely related variety that may have been a dialect of Mono, is already extinct. It was located in the arrondissement of Rey Bouba (Mayo-Rey department, North Region). Distribution
Mono is spoken north of Rey Bouba, around Kongrong, and along the Mayo-Godi River (Rey Bouba commune, Mayo-Rey department, Northern Region). Spoken by 1,100 speakers, Mono is in decline as speakers are shifting to Fulfulde. References

Blench, Roger and Stefan Elders. A wordlist of Mono, a highly endangered Adamawa language of Cameroun. Languages of Cameroon
Mbum languages