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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).

This map of the Sunda Isles (‘Isles de la Sonde’) (with red borders) and Maluku Islands (‘Isles Moluques’) (green borders) also includes mainland Southeast Asia (blue borders), the Philippines (yellow borders) and New Guinea (green borders).

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).

On this map of Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers: e.g. at this time, Benkulen (Bencoolen) on the west coast of Sumatra is British, and Malacca is Dutch.

On this map of Asia, borders are outlined and cities underlined in different colours to show the colonial territories of the European powers: e.g. at this time, Benkulen (Bencoolen) on the west coast of Sumatra is British, and Malacca is Dutch.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

Map based on the expeditions of Jean-François de Surville, a merchant captain with the French East India Company. Some details are from the diary of the French Navy officer Théobald René, Comte de Kergariou-Locmaria, who explored the region in 1785.

A late 18th century maritime map of Southeast Asia, marked with expedition routes including the return of Captain Cook’s HMS Endeavour from Australia in 1770, and Captain Philip Carteret’s circumnavigation expedition in 1768.

Labels on this late 18th century map of Southeast Asia describe two indigenous populations—the ‘Kemoy’ of the mountains along the border of Cochin China (Vietnam) and Camboja (Cambodia), and the ‘Biayos’ of central Borneo—as ‘a wild Nation’.

In the 18th century, European maps tended to use their own country’s meridian, so on this French map of Southeast Asia longitude is measured from the Paris Meridian. Eleven different scales are also shown.

Coloured borders divide this late 18th century map of Asia into empires, kingdoms and regions. Five major rivers that flow south through mainland Southeast Asia are named: Aua, Pegu, Tenasserim, Menan and Camboya.