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Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, and names of coastal settlements, all to aid navigation. With a colourful compass rose.

A map of the Java Sea between Java, Sumatra and Borneo. The web of lines is a rhumbline network, used to aid navigation. The cartouche and scale are decorated with paintings of Asian people and mythical creatures including cherubs.

A map of the Java Sea between Java, Sumatra and Borneo. The web of lines is a rhumbline network, used to aid navigation. The cartouche and scale are decorated with paintings of Asian people and mythical creatures including cherubs.

A map of the Java Sea between Java, Sumatra and Borneo. The web of lines is a rhumbline network, used to aid navigation. The cartouche and scale are decorated with paintings of Asian people and mythical creatures including cherubs.

Two pages from ‘Rerum et urbis Amstelodamensium historia’ by Johannes Pontanus, featuring a drawing of the attack on Madura by the ships of the Dutch merchant seaman Cornelis de Houtman, in revenge for an unrelated pirate attack.