The Orang Utan is native in Sabah, Sarawak and Kalimantan. 

Various organisations have set up orang utan rehabilitation centres in or near the Borneo jungle.

Most rehabilitation centres have set up Visitor Centres in order to support the up-keeping of the rehabilitation work.

Tourists and visitors can visit these centres either as individual tourists or as part of a tour. Many travel agencies in Sabah and Sarawak offer Orang Utan tours  every day. For individual visitors it is essential to only arrive at the feeding times, as otherwise there will be no access to the orang utans.

Sarawak
 
Semenggok Orang Utan Rehabilitation Centre in Sarawak
Orang Utans are prepared for their release into the Borneo jungle. Visitors can see them at feeding time.

Sabah

Sabah has probably the most known orang utan rehabilitation centre. Orang Utans are prepared for their release into the Borneo jungle. Visitors can see them at feeding time.

Kalimantan
Kalimantan has several Orang Utan rehabilitation centres, mainly located in Central Kalimantan.  
 
Borneo has also other rehabilitation and animals and nature conservation projects, often sponsored by international organsations.