45,000 (Wurm and Hattori 1981).
West Kalimantan Province, Sanggau regency. Kapuas river, both sides, west, south of Sanggau town.
Dosan, Mayau, Sanggau. Very heterogenous dialects, probably more than 1 language in this group. Not all Sanggau isolects mutually intelligible. Koman and Semerawai could be in this group.