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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.

The illustration on this map highlights the wealth of the Asian trade routes, with merchants wearing colourful and elaborate robes presenting valuable treasures to a royal figure. A monkey, tortoise and camel emphasise the 'exoticism' of Asia.