The centre is typically closed to visitors to increase the rehabilitation success of its 600-or-so orang-utans. The tiny visitor centre opens on the weekends; you can see a few caged animals through its large windows. It's about 30km north of Palangka Raya and 2km from the main road. Follow signs for the Nyaru Menteng Arboretum.
Borneo Orangutan Survival Foundation