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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’.

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’.

Nautical charts like this are detailed around the coasts and on the seas (e.g. river mouths, islands, shoals and reefs) while the interiors are blank. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry).

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.

This mid-18th century maritime map charts the seas between Peninsula Malaysia and Sumatra, including Singapore—named ‘Po. Panjang’—with the old and new Straits of Singapore marked. The numbers indicate sea depth (bathymetry).