In developing his ecological argument, Geertz divides the country into two geographical regions, "Inner Indonesia" encompassing Northwest, central, and East Java, South Bali, and West Lombok, and"outer Indonesia" made up of the outer Islands plus southwest Java D11, pp. 12-151. These two parts are distinct in terms of popula density(high density for the former and low for the latter, tion land use(intensive in the first case and extensive in the second and agricultural productivity per unit of land(high in the former instance and low in the latter) These differences are accounted for by the different ecosystems as represented by the form of agricultural production, i.e., the sawah system in"Inner Indonesia vs. the swidden system in"outer Indonesia.