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Hillshade generated from SRTM 90m DEM available from the CGIAR website (http://srtm.csi.cgiar.org/). Bathymetry from the ETOPO1 Global Relief Model downloaded from: http://www.ngdc.noaa.gov/mgg/global/global.html Sumatran orangutan distribution shapefile prepared by Singleton and Wich and based on Wich et al. 2008 with unpublished data added. Geological and Mining Area Environment. Data provided by the World Agroforestry Centre Agus, F. and Wahdini, W. 2008. Assessment of Carbon Stock of Peat-land at Tripa, Nagan Raya District, Nanggroe, Aceh Darussalam. Province of Indonesia. Indonesia Centre for Agriculture Land Resources Research and Development. van Schaik C.P., Azwar and Priatna D. 1995. Population estimates and habitat preferences of orangutans based on line transects of nests. In: Nadler, R.D., Galdikas, B.F.M., Sheeran, L.K. and Rosen, N. (eds).The neglected ape. Plenum Press, New York. Pp. 109-116. Wahyunto, R.S. and Subagjo, H. 2003. Map of peatland distribution area and carbon content in Sumatra. Wetlands International Indonesia Program and Wildlife Habitat Canada (WHC).