The Kutubuan languages are a small family of neighboring language groups in Papua New Guinea, named for Lake Kutubu in the Southern Highlands Province, tentatively placed within the Papuan Gulf grouping's Kikorian branch. The family splits into an East Kutubuan branch, Foe and Fiwaga, and a West Kutubuan branch, Fasu, Some and Namumi, with lexicostatistical similarity of 60 to 70 percent within each branch but only 10 to 20 percent between them.
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