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This map of China features a small part of northeastern Southeast Asia. Population density is shown, along with rivers, trade routes, tidal river navigation limits, railways (existing and suggested), and two coal mines in Tong-King (Vietnam).

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.