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Naba is a Nilo-Saharan language spoken by approximately 500,000 people in Chad. Those who speak this language are called Lisi, a collective name for three closely associated ethnic groups, the Bilala, the Kuka and the Medogo, that represent the three dialects in which Naba is subdivided. They live mainly in the Batha Prefecture, but the Kuka also reside in Chari-Baguirmi. Ethnologue estimates the lexical similarity among the three dialects to be no less than 99%. Arabic is often spoken as a second language.
/f/ can also be heard as in initial position, in free variation.
/tʃ/ can also be heard as when in intervocalic positions.
Affricate sounds /tʃ, dʒ/ are heard as palatal stop sounds when affected by fortition in pre-consonantal positions.
/r/ may be heard as approximants in intervocalic positions. It may also be pronounced as a uvular trill when before back vowels in intervocalic positions.
Scherrer, Elaine Marie (2022). A phonological description of Naba. Afrika und Übersee 95. pp. 76–134.{{cite book}}: CS1 maint: location (link) CS1 maint: location missing publisher (link)
