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Navigation map of the northwest coast of Sumatra. Bathymetry (sea depth), anchor points, shoals and other obstructions (clay, coral, mud, stones, sand) are marked, with hills and settlements to use as landmarks.

Designed to aid navigation around the southeast coast of Borneo, this map features bathymetry (sea depth), and is marked with shoals, reefs and other hazards. Mountains (with their heights) and other landmarks along the coasts are also marked.