The "Great Song" corresponding to "Jin" is actually the Southern Song Dynasty, which is in the south of the Yangtze River. The Southern Song Dynasty was not "big".

Territory of the Southern Song Dynasty: in the 11th year of Shaoxing (1 14 1), Song and Jin agreed to take the Huaihe River as the boundary. In the second year, the western boundary was adjusted to Dasanguan (now southwest of Baoji City, Shaanxi Province), south of Qinling Mountains. Although there were some changes later, the border between Jin and Song was basically stable on this line. The western part of the Southern Song Dynasty was Tubo and Dali. As shown in the figure:

The territory of gold: east to the beggar's gang and other ethnic settlements in the lower reaches of the Huntong River, reaching the Sea of Japan; North to Puyu Road (now Kedong County, Heilongjiang Province), north to Huolu Huotuanmuke (now the upper reaches of South Boroda River in Xing 'an Mountains outside Russia), northwest to Hetao area, adjacent to desert tribes such as Mongolia, Tatar and Wanggubu; In the west, the side ditch near Taizhou is adjacent to Xixia. The Southern Song Dynasty is bounded by Qinling Mountains and Huaihe River, and the western part is bounded by Dasanguan and Song.

The following is the whole territory of China during the Jin and Song Dynasties: