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A plan of the city of Manila, Philippines, showing the streets and buildings—categorised as military (coloured red), civil (yellow) or religious (blue)—around the Pasig River. The city is surrounded by suburbs, fields and wetlands.

A map to aid in the navigation of the rivers leading to Saigon (Ho Chi Minh City, Vietnam). Details include bathymetry (water depth), currents, and a side view (or ‘elevation’) of hills to use as a landmark. Tides are described in written remarks.