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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.

The colonial territories of British North Borneo are shown in pink on this late 19th century map, with Brunei and Sarawak in green, and Dutch colonial territory in yellow. Sea routes around the British Empire are depicted on an inset map.