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Hand-drawn portolan (nautical) chart, featuring a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, elevations (side views of landmark mountains), and names of coastal settlements, all to aid navigation.

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.