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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 map features eight expedition routes across the South China Sea from 1752 to 1763. The web of lines is a rhumbline network, and bathymetry (sea depth) is marked. The place names are in French, but with an English title and notes.

Notes on the back of this map describe the kingdoms of mainland Southeast Asia: religion (people are idolaters, a few Christians and Jews, many Muslims), royalty (kings are rich, people are unhappy) and geography (rivers render the lands fertile).

Notes on the back of this map describe the kingdoms of mainland Southeast Asia: religion (people are idolaters, a few Christians and Jews, many Muslims), royalty (kings are rich, people are unhappy) and geography (rivers render the lands fertile).