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Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

Navigation map of the southern South China Sea, with bathymetry (sea depth), islands, shoals and reefs marked. There are four maritime routes to China marked, with notes on what months or monsoon season to use them. Inset map of Gulf of Thailand.

The title of this mid-18th century map of Sumatra and the Malay Peninsula claims that it was based on the diaries of sailors. Interestingly, the title is repeated in both German and French, as are the names of some of the locations marked on the map.