Mainstream Kenyah, also known as Usun Apau and Bakung, is a Kenyah dialect cluster of North Kalimantan, Indonesia, and Sarawak, Malaysia. Dialects fall into four clusters:Lepo’ Tau, Lepo’ Bem, Uma’ Jalan, Uma’ Tukung Lepo’ Ke, Lepo’ Kuda Lepo’ Maut, Lepo’ Ndang, Badeng (Madang) Bakung, Lepo’ Tepu’.