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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.

Map of the Malay state of Johor, and Singapore. The route of a proposed railway north from Johor Bahru is shown. Apart from rivers and mountains, much of the terrain is blank, with labels such as ‘Unexplored Hill Country’ or ‘Dense Jungle and Swamp’.