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In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Asia longitude is measured from the Paris Meridian. Southeast Asia is divided into regions such as the Birman Empire, Yunshan and Tonquin.

Map focusing on the passages between the islands of maritime Southeast Asia. Many 18th century routes are labelled with the ship/captain’s name and date, and there are notes on some shoals and reefs recording names, details and incidents/shipwrecks.

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.

Two maps of routes around the Flores and Banda seas—through the straits between the Lesser Sunda Islands and the Maluku Islands—towards China. Includes a rhumbline network—a web of lines to help plot routes—bathymetry (sea depth), shoals and reefs.

In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Asia longitude is measured from the Paris Meridian. Southeast Asia is divided into regions such as the Birman Empire, Yunshan and Tonquin.

Map focusing on the passages between the islands of maritime Southeast Asia. Many 18th century routes are labelled with the ship/captain’s name and date, and there are notes on some shoals and reefs recording names, details and incidents/shipwrecks.

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.

Longitude is indicated in two different ways on this mid-18th century map: along the top border, it is shown in degrees (number of degrees east of London); more unusually, along the bottom border, it is shown in time (number of hours east of London).