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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.

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).

This early 18th century map shows Southeast Asia alongside India and part of China, with the names of cities, towns, ports, rivers and mountains marked. A handwritten note at the top left comments on the map's accuracy.