Tapayuna language is a Northern Je language spoken in Mato Grosso, Brazil by the Tapayuna people who historically have lived on the Arinos River.
Tapayuna (Kajkwakhrattxi or Kajkwakhratxi, also spelt Tapajuna, Tapayuna: Kajkwakhrattxi kawere [kajkwakatti kawee]) is a Northern Je language (Je, Macro-Je) spoken in Mato Grosso, Brazil by the Tapayuna (Kajkwakhrattxi) people. The Tapayuna historically lived on the Arinos River, in the Tapajos basin, between Juruena and Aripuana. 
