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Fifty-seven separate maps of bays, roadsteads—a body of water sheltered from tides/currents—and anchor points around the Lesser Sunda Islands. Landmarks, lighthouses, bathymetry (sea depth), shoals, reefs and other obstructions are marked.

Map of the Dutch colonial administrative region of the island of Madoera (Madura), featuring bathymetry (sea depth), and an inset map of the Kangean Islands. (From ‘Algemeene Atlas van Nederlandsche Indie [General Atlas of the Dutch East Indies]’.)

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.