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The Kingdoms of Burmah (Myanmar) and Siam (Thailand) feature on this map of India. Mountain ranges, rivers, and a teak forest are marked, along with major settlements.

The Kingdoms of Burmah (Myanmar) and Siam (Thailand) feature on this map of India. Mountain ranges, rivers, and a teak forest are marked, along with major settlements.

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 the Menam River (Chao Phraya River) from the city of Ayutthaya (labelled ‘Ville de Siam’), past Bangkok to its mouth in the Gulf of Thailand. Features forts, villages, and a royal palace along the route.

Map of the Menam River (Chao Phraya River) from the city of Ayutthaya (labelled ‘Ville de Siam’), past Bangkok to its mouth in the Gulf of Thailand. Features forts, villages, and a royal palace along the route.

Map of the Meinam (Chao Phraya) river from the city of Judia (Ayutthaya) to its mouth near Bangkok. Features temples, villages, a Bishop's Palace, a fort at Bangkok, and a ‘Champ des Eléphans [Elephant Field]’. The text is in French and Dutch.

Map of the Meinam (Chao Phraya) river from the city of Judia (Ayutthaya) to its mouth near Bangkok. Features temples, villages, a Bishop's Palace, a fort at Bangkok, and a ‘Champ des Eléphans [Elephant Field]’. The text is in French and Dutch.

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.