It occurs only in Myanmar and was named after Mount Popa, where a population of 100 of the monkeys live.

A phylogenetic study was conducted in an effort to understand the Popa langur's taxonomic relationships with other species of the genus.

The examination revealed small differences in their skins, skulls and coloration.

[4] The Popa langur has a dark-brown or grey-brown back, a white belly, and black hands and feet.

[4] The Popa langur is threatened by hunting, habitat destruction and fragmentation.