Singleton, I., Wich , S.A., Nowak, M., Usher, G. & Utami-Atmoko, S.S. 2017. Pongoabelii (errata version published in 2018). The IUCN Red List of Threatened Species
Sumatran Orangutan (Pongoabelii) range Date 29 December 2010 Source Base map derived from File:BlankMap-World.png. Distribution data from IUCN Red List