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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.

On this map of Asia, New Guinea is shown as two separate islands—the western part as ‘Isle de Papous’ and the eastern part as ‘Nouvelle Guinée’—showing that in the 1770s the details of the region were uncertain.

On this map of Asia, New Guinea is shown as two separate islands—the western part as ‘Isle de Papous’ and the eastern part as ‘Nouvelle Guinée’—showing that in the 1770s the details of the region were uncertain.

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.

Map of the Gulf of Siam (Gulf of Thailand) with shoals and small islands marked. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. There is an inset map of the Redang Archipelago.

Map of part of Southeast Asia, featuring a maritime route from the Sunda Strait to the ports of Bantam (Banten) and Batavia (Jakarta) on Java, and then up through the Gulf of Thailand to the Kingdom of Siam. The return route is also marked.

Map of part of Southeast Asia, featuring a maritime route from the Sunda Strait to the ports of Bantam (Banten) and Batavia (Jakarta) on Java, and then up through the Gulf of Thailand to the Kingdom of Siam. The return route is also marked.