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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.

The arrows on this map show the direction of the seasonal monsoons of Southeast Asia during the late 18th century. Each arrow has a label in French, indicating the month. The hatched sea areas are where the winds always blow in the same direction.

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 mid-18th century map features labels noting the local populations, including the Kemois of the mountains and deserts of Cochinchinae (Vietnam) and the Byayos of Borneo. The map’s cartouche is embellished with maritime and military paraphernalia.

This map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain. Sheet two of two.

This map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain. Sheet two of two.

This map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain. Sheet two of two.

This mid-18th century map features a label noting that the Byayos people inhabited the mountains of central Borneo. Another note at the northeast tip of Borneo states that the location and number of islands in the area is uncertain.

Colourful map of the East Indies focusing on maritime navigation: there is a compass rose at the centre of a rhumbline network (a web of lines to help plot routes). Shoals, reefs and islands are also marked.