Yessan-Mayo (also known as Yesan, Mayo, and natively known as Yamano) is a Papuan language spoken by 2000 people in Papua New Guinea. It is spoken in Maio () and Yessan () villages of Yessan ward, Ambunti Rural LLG, East Sepik Province.
The phonology of Yessan-Mayo is described in Foley (2018) as such:
Foreman (1974) describes two kinds of pronouns in Yessan-Mayo: non-emphatic and emphatic pronouns.
In addition to the non-emphatic pronouns, there is also the reflexive pronoun kwarara (self), as well as the demonstrative pronouns op (this) and otop (that).