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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.

A map of the administrative divisions of Sumatra and the Malay Peninsula. The mountains of western Sumatra and the central Malay Peninsula are represented by hachures: short lines/dashes that give a sense of the shape and steepness of terrain.