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Map of the Tunquin River (Red or Hong River) from the city of Cacho (Hanoi, Thailand) to its mouth. At the mouth, bathymetry (sea depth), shoals and anchor points are marked. A place named Hean is labelled as an English and French trading post.

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 Tunquin River (Red or Hong River) from the city of Cacho (Hanoi, Thailand) to its mouth. At the mouth, bathymetry (sea depth), shoals and anchor points are marked. A place named Hean is labelled as an English and French trading post.

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.