Yetfa and Biksi (Biaksi) are dialects of a language spoken in West Papua, Indonesia, and across the border in Papua New Guinea. It's a trade language in West Papua up to the PNG border.The language is not close to others. Ross (2005), following Laycock & Z’Graggen (1975), places Biksi in its own branch of the Sepik family, but there is little data to base a classification on.