Koreguaje language
Korebaju, Coreguaje (Korewaje, Ko'reuaju) is a Tucanoan language of Colombia.

The language was spoken in the film Out of the Dark.

Phonology

Vowels 
Koreguaje has 6 vowels. All vowels have nasalized forms:

Consonants 

 /ɾ/ can be heard as retrofex [ɽ] in initial positions.
 /w/ can fluctuate to a voiced fricative [β] in free variation.
 /ʍ/ can be he heard as [ɸ] or [f] when preceding /i/.

References

Languages of Colombia
Tucanoan languages