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Lower Cross River language of Nigeria
Not to be confused with Enwan language.
Uda was the subject of a month-long intensive field methods course through CoLang (the Institute on Collaborative Language Research) in 2012 at the University of Kansas. The course relied on two native speakers from Nigeria.
References
Enwan at Ethnologue (18th ed., 2015) (subscription required) Uda at Ethnologue (18th ed., 2015) (subscription required)