40,000 (Tjia 2007).
West Kalimantan Province, Belitang Hilir, Belitang, and Belitang Hulu Sekadau subdistricts. Area along Ayak and Belitang rivers, about 320 km upstream from Pontianak.
Mualang Ili’, Mualang Ulu. Similar to Iban [iba]; however only one-way intelligibility from Mualang to Iban.
Language shift reportedly taking place in the younger generation. Positive attitudes.