This is a faithful photographic reproduction of a two-dimensional, public domain work of art. The work of art itself is in the public domain for the following reason:
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.
{{Thông tin |Miêu tả = Sông An Nam Giang là biên giới của Việt Nam-Trung Hoa trước năm 1887, trong các bản đồ cổ của người phương Tây những năm 1737, 1740, 1839. |Nguồn = https://commons.wikimedia.o…