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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 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 northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

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 northern Malacca Strait—between Sumatra and Malaya—with shoals and reefs marked, some labelled as ‘dangerous’. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

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.

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.

Maps like this aided navigation through the islands, shoals and reefs of Singapore and the Malacca Strait. Three routes around Singapore are shown, numbers on the sea indicate water depth, and the profile views of mountains were used as landmarks.

This colourful mid-18th century map of the Sunda Isles (‘Isles de la Sonde’) includes the Malay Peninsula in addition to Sumatra, Java and Borneo. Mountain ranges and jungles are shown pictorially, and the islands and coasts feature shoals and reefs.

Map marking the routes through maritime Southeast Asia of two delegations: a French delegation from Brest, France to Siam in 1685; and a Siamese delegation from Siam to Brest in 1686. A note next to Aceh records a sea battle against Portugal in 1616.