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Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

Chart of maritime Southeast Asia, showing bathymetry (sea depth), islands, shoals, reefs, landmarks, and notes (‘Rock seen at Low Water’), all to aid navigation. A rhumbline network has been drawn on the map in pencil. Only one sheet is present.

This 18th century maritime navigation map charts the waters between the islands of Java, Sumatra and Borneo. A route south towards the Sunda Strait, as taken by the French ship Mascarin in March and April 1772, is highlighted.

This 18th century maritime navigation map charts the waters between the islands of Java, Sumatra and Borneo. A route south towards the Sunda Strait, as taken by the French ship Mascarin in March and April 1772, is highlighted.

This 18th century maritime navigation map charts the waters between the islands of Java, Sumatra and Borneo. A route south towards the Sunda Strait, as taken by the French ship Mascarin in March and April 1772, is highlighted.

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.

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.