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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 from 1800 is by the Scottish cartographer Alexander Dalrymple, who was the first Hydrographer of the British Admiralty. It documents the river systems of the Birman Empire (Myanmar) and modern Thailand, Laos, Cambodia and Vietnam.

A late 18th century map of Asia featuring rivers, mountains, reefs and shoals. Regions are colour-coded, with the borders of the kingdoms of mainland Southeast Asia in green, and the islands of maritime Southeast Asia in yellow and red.

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).

A late 18th century map of Asia featuring rivers, mountains, reefs and shoals. Regions are colour-coded, with the borders of the kingdoms of mainland Southeast Asia in green, and the islands of maritime Southeast Asia in yellow and red.

A map of the China Sea between Malaya, Sumatra and Borneo. The numbers indicate sea depth (bathymetry), and there are drawings of the side views of some of the islands (elevations), both used to aid navigation. Some maritime routes are also marked.

This late 18th century map features a number of labels describing the local populations, including the Kemoys ('Savage People') of the mountains of Cokin China (Vietnam), the Biayos of Borneo, and the 'Wild People' of the mountains of Pegu (Myanmar).

A late 18th century navigation map of the waters between the islands of Java, Madura and Bali. The web of lines is a rhumbline network, the numbers indicate sea depth (bathymetry), and there is an inset map of the Bay of Ballambouang, Java.

Hand-drawn coloured borders have been added to this map to distinguish various regions: mainland Southeast Asia and most of the islands of maritime Southeast Asia are bordered in green, with Borneo and the Philippines in red.

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’.

A piece of paper printed with a list of the various regions of Asia, including the regions of Southeast Asia, has been adhered to the right-hand side of this late 18th century map of Asia.

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.