Warembori (native name Waremboivoro) is a moribund language spoken by about 600 people in Warembori village, Mamberamo Hilir District, Mamberamo Raya Regency, located around river mouths (including the mouth of the Warembari River) on the north coast of Papua, Indonesia.

Classification is in dispute. Mark Donohue thinks it is related to Yoke, forming together the Lower Mamberamo family. On a 200 word list, they share 33%. Also there are some grammar similarities. According to Donohue, Warembori is heavily influenced by Austronesian languages to the west, in both vocabulary and grammar, Yoke is less influenced by them. More recent researchers (Dunn & Reesink, Foley, Kamholz) have classified Warembori and Yoke as papuanised Austronesian languages. Malcolm Ross leaves Yoke unclassified due to lack of data, apparently referring to the fact that Donohue did not publish independent pronouns in Yoke. He did publish subject prefixes on verbs, which are very similar to Warembori, and the singular prefixes are also remarkably similar to two Kwerba family languages, namely Kauwera and Airoran, suggesting either borrowing or a distant relationship to Kwerba, though the Kwerba family shares almost no vocabulary with the Lower Mamberamo family. The Lower Mamberamo plural prefixes are similar to Austronesian, as are the plural object suffixes and, at least in Warembori, plural independent pronouns.

Kamholz (2024) and Glottolog both classify Warembori and Yoke as Austronesian, more specifically primary branches of South Halmahera–West New Guinea.

The sequence /nk/ is realized as [ŋɡ].

The light voiced stops /b d/ lenite to [β r] between vowels within a word. The heavy stops do not lenite.

When a nasal is followed by a heavy plosive, it is lengthened, i.e. /mˀb/ [mːb] /nˀd/ [nːd]. When not followed by a stop, heavy nasals are long and preceded by a glottal closure, i.e. /ˀm/ [ʔmː] /ˀn/ [ʔnː]. Heavy consonants also attract stress.

Some minimal pairs of heavy consonants are:

The independent pronouns are: