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In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Southeast Asia longitude is measured from the Paris Meridian. Eleven different scales are also shown.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

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 Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

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.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.

Three of the larger Sunda Islands—Sumatra, Java and Borneo—are shown on this mid-18th century map, along with a few of the smaller islands such as Bali, Lombok and Sumbawa. Celebes (Sulawesi) and some of the other smaller islands are not included.

This map shows the islands of Java, Sumatra and Borneo, the straits of Sunda, Malacca and Bangka, and the Gulf of Siam. The points of the compass can be seen radiating out from a central compass rose.

Three of the larger Sunda Islands—Sumatra, Java and Borneo—are shown on this mid-18th century map, along with a few of the smaller islands such as Bali, Lombok and Sumbawa. Celebes (Sulawesi) and some of the other smaller islands are not included.

The regional borders of early 18th century Southeast Asia are shown on this map. Mountains are shown pictorially, and larger settlements are marked with a red building symbol. Southern Borneo is labelled ‘Pays des Mahometans [Land of the Muslims]’.

The regional borders of early 18th century Southeast Asia are shown on this map. Mountains are shown pictorially, and larger settlements are marked with a red building symbol. Southern Borneo is labelled ‘Pays des Mahometans [Land of the Muslims]’.