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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.

On this map of Sumatra, the west coast mountain ranges contrast with the rivers to the east. An inset map of Singapore focuses on jungles along the coasts, and features bathymetry (sea depth) around the south coast and along the Singapore Strait.