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Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

Navigation map of the northern South China Sea, with bathymetry (sea depth), islands, shoals and reefs. There are five maritime routes to Canton and one to Manilla marked, and inset maps of the Gulf of Tonkin and bays and islands in the Philippines.

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.