Saluan language
Saluan, or Loinang after one of its dialects, is the main language of the eastern peninsula of the island of Sulawesi.

Phonology 

In some dialects, the distinction between /l/, /r/ and /n/ is neutralized to /n/ in word-final position, as in putan 'rope' (putal in most dialects).

The central vowel  is restricted to certain dialects.

In final position, there is a phonemic distinction between long and short vowels, e.g.  'tail' vs.  'elbow'.

References

Saluan–Banggai languages
Languages of Sulawesi