The maroon langur is a leaf monkey of Borneo and the Karimata Islands. Its coat ranges from reddish brown to golden, and it feeds on forest plants.
Its coat ranges from reddish brown to golden, and the skin of the face is bluish.
One group observed at Sepilok fed mainly on young leaves and seeds from trees and lianas in lowland dipterocarp forest.
An extinction-risk assessment has not been added yet.