Umaʼ Lasan (Western Kenyah) is a Kayan language of Borneo. Umaʼ Lung is marginally intelligible with the other varieties.
External links
^Umaʼ Lasan (Sarawak, Malaysia at Ethnologue (18th ed., 2015) (subscription required) Umaʼ Lung (East Kalimantan and North Kalimantan, Indonesia) at Ethnologue (18th ed., 2015) (subscription required)