Proto-Momo was a language spoken in the Harla Region. The name Momo comes from the Momo word Mom, meaning whale, which was and is sacred to most Momoan people.
Proto-Momo gradually split into various dialects. The dialects largely differed in phonolgy, with the southern dialects having a few extra phonemes.
As far as it is known, Proto-Momo had no relatives, although this is debated. Some linguists claim that the extinct and little-attested language Mitaj was related. Other linguists claim that Proto-Momo was related to Proto-Ála or the Suban languages. None of these proposals are accepted at the present time.
Proto-Momo had 4 vowels. Whether or not o* was [o], [u], or both is not known.
Stress in Proto-Momo almost fell on the final syllable.
Proto-Momo nouns were famously had no inflection.
The Proto-Momo verb was also fairly simple. The most important distinction in Proto-Momo verbs was voice. Proto-Momo inflected for Person, Benefactive/Malefactive, and Evidentiality. All other verbal inflection was expressed periphrastically.
Voice was crucial in Proto-Momo. There were three voices: Active, Passive, and Middle.