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The border of the Kingdom of Siam (Thailand) and its internal administrative districts are highlighted in yellow. Inset maps show the cities of Bangkok, Chiengmai (Chiang Mai) and Luang Pra Bang (Luang Prabang) in more detail.

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.

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.