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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Sumatran orangutan distribution shapefile prepared by Singleton and Wich and based on Wich et al. 2008 with unpublished data added. The suitability of different land systems for various agricultural products taken from the RePPProT (Re-gional Physical Planning Programme for Transmigration) project of the 1980’s. Each land system was assessed as Suitable, Unsuitable, or Unsuitable without inputs for a number of commodities. Landsystems were mapped at a scale of 1:250,000. Land Resource Department/Bina Program, 1988. Review of Phase I Results from Regional Physical Planning Programme for Transmigration (RePPProT) Land Resources Department, Overseas Development Administration, London, UK; and Direktorat Bina Program, Direktorat Jenderal Penyiapan Pemukiman, Jakarta, Departemen Transmigrasi, Indonesia.