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This map of Asia, from an atlas by the German cartographer Karl von Spruner, is colour-coded to show the colonial possessions of the European powers—Netherlands, Portugal, Spain, France, Britain and Denmark—at the end of the 17th century.

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.

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.

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).