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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Sumatran orangutan distribution shapefile prepared by Singleton and Wich and based on Wich et al. 2008 with unpublished data added. Slope classes and elevations above 2000m generated from SRTM 90m DEM (available from the CGIAR website: http://srtm.csi.cgiar.org/); sensitive soil types on slopes of above 15% determined from 1:250,000 land unit soil map series published by the Pusat Penilitian Tanah dan Agroklimat, Bogor, 1990. Peat depth larger than 3 m adapted from Wetland International Indonesia.