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Two maps of the Dutch East Indies, decorated with drawings of local people and animals. Dutch colonial territory and local sultanates and provinces are highlighted. The heights of Java’s mountains and settlements are displayed in an elevation view.

This map of the Straits of Malacca features shoals and reefs, bathymetry (sea depth), drawings of side views of landmark mountains (elevations) and written observations, all designed to aid navigation.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

A page from Abbé Prévost’s ‘Histoire Générale des Voyages’. The top map shows the Bay of Laphao on Timor, while the other drawings are side views (or ‘elevations’) of mountains on the region’s islands to use as landmarks when navigating.

The many navigation aids marked on this map, including bathymetry (sea depth), anchor points, shoals, and elevations of hills, were designed to guide ships around this part of the west coast of Timor. The Dutch fort Concordia is also marked.

A map of Java with mountains, jungles, animals and crops. Bathymetry (sea depth) is marked, including on an inset map of Batavia harbour. Illustrations include Batavia Castle, and a lion—representing Belgium—receiving tribute and enslaving locals.

This early 18th century maritime map charts the waters between the islands of Java, Madura and Bally (Bali). The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.