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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 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.

A brightly-coloured hand-drawn map of the Gulf of Siam, made for a ship’s captain. The elaborate compass roses are the centre of a rhumbline network, a web of lines to aid navigation. Bathymetry (sea depth), islands, shoals and reefs are also marked.