Mbum languages
The Mbum languages are a small group of the Mbum–Day branch of the erstwhile Adamawa languages, spoken in southern Chad, northwestern Central African Republic, northern Cameroon, and eastern Nigeria. Their best-known member is Mbum; other languages in the group include Tupuri and Kare.
They were labeled "G6" in Joseph Greenberg's Adamawa language-family proposal.
Languages
Southern Mbum: Mbum proper, Mbere, Gbete
Central Mbum
Karang: Karang (Mbum, Laka), Nzakambay (Njak Mbai), Pana, Ngumi, Kare (Kãrɛ̃)
Koh: Kuo (Koh), Sakpu
Northern Mbum
Dama–Galke: Dama, Ndai (Galke, Pormi), Mono, Kali
Tupuri–Mambai: Mangbai, Mundang, Tupuri
In addition, Pondo, Gonge, Tale, Laka, Pam, and To are unclassified within Mbum. To is a secret male initiation language of the Gbaya. Dek is purported in some sources but apparently unattested.