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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.

Maps like this aided navigation through the islands, shoals and reefs of Singapore and the Malacca Strait. Three routes around Singapore are shown, numbers on the sea indicate water depth, and the profile views of mountains were used as landmarks.