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This colourful hand-drawn portolan (nautical) chart was designed to aid navigation. It features a rhumbline network (the web of interconnected lines), bathymetry (sea depth), shoals and reefs, anchor points and written notes.

This mid-17th century map of Southeast Asia is from Isaac Commelin’s book describing the voyages of the Dutch East India Company ‘Begin ende voortgangh…’. There is an inset map of the island of Botton (Buton Island, southeast of Celebes (Sulawesi)).