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Map of the coast of Tsiompa and Couchinchina (Vietnam) designed for navigation, with a rhumbline network and bathymetry (sea depth). The large area marked with crosses represents the Paracel Islands. The modern city of Da Nang is at the far right.

Hand-drawn map of the Singapore Strait, with Singapore above (green coastline) and the Riau Archipelago below. Bathymetry (sea depth), shoals and reefs are marked. Two mountains at the eastern end of the strait are shown in profile as landmarks.