Neighbouring ethnic groups are Banjar people, Ngaju people, and Ma'anyan people. Thus there is high lexical similarity with the neighbouring languages (75% with Ngaju, 45% with Banjar). In addition, Berangas language who endangered is also very similar to Bakumpai, possibly a dialect.
Vocabulary comparison
The following is a vocabulary comparison between the closely related Bakumpai and Ngaju languages, as well as Indonesian and its translation into English.
^ abHapip, Abdul D. (1984). Struktur Bahasa Barangas (in Indonesian). Jakarta, Indonesia: Pusat Pembinaan dan Pengembangan Bahasa, Departemen Pendidikan dan Kebudayaan.