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Early navigation map of the South China Sea. The web of lines is a rhumbline network, while the numbers indicate sea depth (bathymetry), both used to aid navigation. A route around the Gulf of Thailand is marked with text and the dates 1643 and 1644.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

Map of the Me-nam River (Chao Phraya River) with the city of Ayutthaya (labelled ‘Siri India’) in the centre. Its mouth at the Gulf of Thailand is to the left. Over 100 buildings, towns and other places are shown pictorially and listed in the legend.

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.

The colonial possessions of Britain, the Netherlands, Spain, Portugal and Denmark are shown on this mid-19th century map of Southeast Asia. There are inset maps of Penang Island and Singapore, and text describing the region’s colonial history.

This mid-19th century map of Southeast Asia is illustrated with drawings of indigenous people from New Guinea, a ‘bee bear’ (probably a sun bear), a sailboat in front of Victoria Mount in New Guinea, and a village and palm trees in Sarawak, Borneo.

A sketch of the river networks discharging into the Gulf of Siam (Gulf of Thailand), derived from the observations of mid-19th century American missionaries. Settlements along the rivers are noted, as are areas where sugarcane was grown.