L1 users: 45,000 (Wurm and Hattori 1981).
Kalimantan Barat province: Sanggau regency along Kapuas river.
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.
Also use Kendayan [knx].