China map must comply with the following provisions:
Accurately reflect the territory of China.
(1) Map range: draw the intersection of Heilongjiang and Wusuli River in the east, draw the north stream of basin pool in the west, draw the northernmost section of Heilongjiang in the north, and draw Zengmu shoal in the south (except the historical map before Han Dynasty).
(2) The whole map of China must represent the South China Sea Islands, Diaoyu Islands, chiwei yu and other important islands, and draw the line of the South China Sea Islands' belonging range with corresponding symbols. If the scale is equal to or less than 1: 1 100 million, the line of South China Sea Islands can be changed from 9-segment line to 7-segment line, that is, the second and seventh segments are deleted from the left, which does not mean Diaoyu Island and chiwei yu.
Refer to the above content: Baidu Encyclopedia-Map of China