L1 users: 4,200 (Wurm and Hattori 1981).
Sarawak: Bintulu area, and 2 enclaves west; Sibuti area on northeast coast.
None known. Could also be classified as a Baram-Tinjar subgroup or as an isolate within the Rejang-Baram Group.
Blust classifies it as an isolate with North Sarawakan. Not similar to other languages (Blust 1974).