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Map of the Indian Ocean showing the currents (represented by arrows), including during the North East and North West monsoons. Numbers on the arrows indicate the current’s speed.

Map of the Indian Ocean showing maritime routes, including some to and around Southeast Asia, where they pass through the Strait of Malacca, the Sunda Strait, and the straits between the Lesser Sunda Islands.

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).