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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.

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