|Sepik River basin, Papua New Guinea|
The Walio languages are a small family of clearly related languages,
though they are not close: Walio and Yawiyo have only a 12% lexical similarity. They are frequently classified among the Sepik languages of northern Papua New Guinea, though Glottolog leaves them out.
- 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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