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Navigation map of the waters around the islands of Bengkalis, Pedang and Tebingtinggi, off the east coast of Sumatra. Bathymetry (sea depth), tide data, reefs, shoals and other obstructions (clay, mud, shells, sand) are marked.

Detailed topographical map of the east coast of Sumatra, spread over 36 sheets. The area’s farms are listed and shown on the map within yellow borders, with types of crop grown. There is a detailed plan of Medan, and five inset maps of other towns.