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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.

Nautical charts like this are detailed around the coasts and on the seas (e.g. river mouths, islands, shoals and reefs) while the interiors are blank. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry).

Navigation chart of the east coast of mainland Southeast Asia, from Cambodia to China. Islands, shoals and reefs are marked, along with bathymetry (sea depth). There are seven side views of islands (elevations) to use as landmarks.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

Map of the Bay of Bengal, with the western coast of mainland Southeast Asia. Shoals, reefs and islands are marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation.

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 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.

Map featuring the ancient kingdoms of mainland Southeast Asia. The cartouche is embellished with maritime and military paraphernalia. The map is dedicated to William IV, Prince of Orange (Guillaume Charles Henry Friso). Sheet one 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.

Map featuring the ancient kingdoms of mainland Southeast Asia. The cartouche is embellished with maritime and military paraphernalia. The map is dedicated to William IV, Prince of Orange (Guillaume Charles Henry Friso). Sheet one of two.