|Frieda and Kenu Rivers|
|Sepik River basin, Papua New Guinea|
Donald Laycock (1973) classified them as part of a Walio–Papi, a.k.a. Leonhard Schultze, branch of his Sepik–Ramu proposal. Malcolm Ross (2005) breaks up Walio–Papi, and suggests that the Papi languages may instead be part of the Sepik Hill branch of the (now Sepik) family. Glottolog does not find the evidence of a Papi family to be convincing.
- Ross, Malcolm (2005). "Pronouns as a preliminary diagnostic for grouping Papuan languages". In Andrew Pawley; Robert Attenborough; Robin Hide; Jack Golson (eds.). Papuan pasts: cultural, linguistic and biological histories of Papuan-speaking peoples. Canberra: Pacific Linguistics. pp. 15–66. ISBN 0858835622. OCLC 67292782.
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