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A late 19th century map depicting a route from Hanoi to That-Khe via Lang-Son (in northern Vietnam, near the border with China at Kouang-Si (Guangxi)). Two inset maps feature plans of military forts, villages, rivers and fields 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 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.