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A late 18th century maritime navigation map of the straits east of Java, with drawings of the elevations of the straits. The map is also marked with routes of explorers, including the return of Captain Cook’s HMS Endeavour from Australia in 1770.

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.