Lower Cape York peninsula, Gulf of Carpenteria coast, between Mitchell and Nassau rivers

"Koko-Bera is actually only one of three named dialects formally spoken throughout much of an area lying within some 30 km of the Gulf of Carpentaria coast between the South Mitchell and Nassau River; (Koko-Bera was a relatively central dialect spoken along Topsy Creek. The other two dialects were Kok-Wap, to the northeast, and Kok-Peponk, to the south (Black MS 1175:19)."