Sumatra, Jambi Province. Eastern swamp region; possibly some in Riau and South Sumatra provinces.
For Kubu living in settled villages, L1 already replaced in all domains outside the home; for Kubu in Jambi areas (more isolated and less sedentary), the vitality is higher. Home. All ages. Positive attitudes. Villagers use Indonesian [ind] or another trade language for education, religion, civic, with other ethnic groups.
Territory rapidly shrinking, somewhat due to deforestation. Traditional religion, Muslim.