Daatsüiin is a B'aga language of western Ethiopia. There are two communities of speakers in western Ethiopia, one in Mahadid, on the northeast border of Alitash National Park, and one in Inashemsh on the Sudan border, south of the park where the Rahad River crosses from Ethiopia into Sudan.
Daatsüiin was first reported in 2013 and described by Colleen Ahland in 2014. Ahland has described it further in 2016. A comparative word list of Daatsüiin, Northern Gumuz, and Southern Gumuz is available in Ahland & Kelly (2014).
Of the other B'aga languages, DaatsüÃÂin has the greatest lexical similarity to Southern Gumuz, but the two groups communicate in Arabic or Amharic.
The consonant inventory of DaatsüÃÂin:
The palatal stops , , can be also realized as palatalized velar stops , , in free variation.
and are rare, both recorded only from one word so far. The former appears to be phonemic, but the latter might be an allophone of .
The voiced pharyngeal fricative only occurs when following or and preceding , and it can be analyzed as an allophone of the glottal stop .
DaatsüÃÂin has eight vowel phonemes:
Ahland analyzes , , , , as phonemically long, and , , as phonemically short , , respectively.
DaatsüÃÂin is also a tonal language: vowels can bear high and low tone. Some examples of downstep occur.
DaatsüÃÂin has several grammatical differences from other Gumuz languages. Verbs inflect for aspect (perfective–imperfective) rather than for tense (future–non-future). Verbs are polysynthetic in all languages, but the order of the morphemes differs in Daatsüiin, and some morphemes that occur in one language do not occur in the other(s). "The major constituent order in DaatsüÃÂin clauses tend to be AVO/SV."