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This late 19th century large-scale (1:30,000) map show just a section of the Siak River, in the Riau province of Sumatra. Bathymetry (water depth) is shown in figures to aid navigation, with various landmarks noted along the river’s banks.

Details of each area’s resources are printed on this map of Sumatra: rattan, coffee, pepper, Chinese cinnamon, tobacco, resins, camphor, cotton, coal, gold, lumber, elephants, horses, as well as the locals’ ethnicity (Malays, Javanese, Acehnese).