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Navigation map of the southern part of the South China Sea, including the straits of Malacca and Singapore, and the Riau Archipelago. Bathymetry (sea depth), lighthouses, shoals and other obstructions are marked, with hills to use as landmarks.

Navigation map of the southern part of the Strait of Malacca. Bathymetry (sea depth), lighthouses (in red and yellow), shoals and other obstructions (clay, coral, mud, rocks, shells, stones, sand) are marked, with hills to use as landmarks.

The use of hachures—short lines/dashes that give a sense of the shape and steepness of terrain—highlight the mountain ranges along the west coast of this map of Sumatra. Many rivers flow east from the mountains to the Malacca Strait.