4,200 (Wurm and Hattori 1981).
Sarawak, northeast coast, Sibuti area, west of Niah; Bintulu area, and 2 enclaves west.
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).