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The border of the Kingdom of Siam (Thailand) and its internal administrative districts are highlighted in yellow. Inset maps show the cities of Bangkok, Chiengmai (Chiang Mai) and Luang Pra Bang (Luang Prabang) in more detail.

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’.