Zaghawa language
The Zaghawa language is a Saharan language spoken by the Zaghawa people of eastern central Chad (in the Sahel) and northwestern Sudan (Darfur).
The people who speak this language call it Beria, from Beri, the endonym of the Zaghawa people, and "a," Zaghawa for 'mouth.' It has been estimated that there are between 75,000 to 350,000 Zaghawa language speakers who primarily live in Chad and the Darfur region of Sudan.
Phonology
Zaghawa has a nine-vowel system with advanced-tongue-root vowel harmony: the vowels fall into two sets, /i e o u/ and /ɪ ɛ a ɔ ʊ/, with the vowels of affixes depending on the set of vowels in the stem, and with /a/ functioning in both sets. There is some variation among dialects as to the presence of a tenth vowel, /ə/, which in some dialects functions as the +ATR counterpart of /a/. Diphthongs are /ei əu iə/ and /aɪ aʊ ɔɪ/. There are five tones, high, mid, low, rising, falling, all of which may occur on simple vowels, for example in /ɪ́ɡɪ́/ I watered, /ɪ̌ɡɪ̂/ I said, /ɪ̀ɡɪ̀/ right (direction). Tone distinguishes words, but also has grammatical functions; for example, the plural of many nouns is formed by changing the tone of the final syllable from low to high, and the perfective aspect of many verbs is similarly formed by changing the tone of the final syllable from low to high.