Girard Victor. Proto-Takanan Phonology

Berkeley and Los Angeles; London: University of California Press, 1971. — 219 p. — (University of California Publication in Linguistics 70).The Panoan languages of South America are spoken throughout a wide territory in the tropical forests of Peru, Bolivia, and Brazil. They are distributed in three geographically discontinuous groups, separated from each other mainly by Arawakan intrusions (Piro, Campa, and Machiguenga) and by the Takanan languages. Classification of the Panoan languages has hitherto been based on these specific geographical groupings. The "Central" group, which is the largest in area and contains the greatest number of speakers and linguistic subdivisions, is found throughout the forests of eastern Peru with unknown extension into western Brazil; the "Southwestern" group is found in southeastern Peru in the area of the Peruvian-Bolivian border and occupies a relatively small area and contains only a few dialects or languages; and the "Southeastern" group is found in the northernmost section of Bolivia at the Brazilian border.
The Takanan languages occupy the territory between the Southwestern and Southeastern Panoan languages: northern Bolivia and the southeastern portion of Peru.