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The seas of the Dutch East Indies are the focus of this map, with maritime routes, sea temperature, sea depth, currents and monsoons shown. There are graphs of population by ethnicity, agriculture and livestock, trade and shipping, and trade exports.

Map of the crops—coconut, alang-alang, rice, nipa palm, bamboo—grown along the Mempawah River (west coast of Borneo). There are also large areas of swampy forest, Malay mosques, shrines and graveyards, and Chinese villages, temples and graveyards.

Map of an expedition exploring two rivers and their tributaries in southern Borneo. Villages and farms are marked (in red for Malay people; in black for Dayak people). Red numbers show height above sea-level in meters; black numbers show latitude.