Map Introduction

I. Establishment and Adjustment of the Administrative System

The formation of the Jiangnan West Route in the Northern Song Dynasty was closely linked to the nationwide reform of the "Route system." When the empire was initially divided into fifteen routes in the 3rd year of the Zhidao era (997 AD), the Jiangnan region had not yet been subdivided. The division of the Jiangnan Route into East and West Routes began in the 4th year of the Tianxi era (1020 AD). The jurisdiction of the Jiangnan West Route included central and southern modern Jiangxi (Hong Prefecture, Ji Prefecture, Qian Prefecture, etc.), while northern Jiangxi areas like Jiang Prefecture (Jiujiang) and Rao Prefecture (Shangrao) still belonged to the Jiangnan East Route. This division was closely related to physical geography: the Gan River basin formed a relatively independent economic unit, whereas Jiujiang and Shangrao had stronger connections to Jiangdong via the Yangtze River waterway.

II. Economic Development and Population Migration

The Jiangnan West Route became a significant granary in the mid to late Northern Song period, with its agricultural development exhibiting three characteristics:

• Terrace Cultivation: Mountainous areas in southern Gan expanded arable land using "building ponds and weirs" technology, resulting in "terraced fields covering the hillsides" in places like Ji Prefecture and Qian Prefecture.
• Cash Crops: Ramie cultivation in Fu Prefecture and Jianchang Commandery (modern Nancheng) formed specialized production areas, with products transported outward via the Xin River-Poyang Lake water system.
• Population Growth: The number of households reached 1.1 million during the Chongning era (1102–1106 AD), a threefold increase compared to the Tianxi period, partly due to immigration from the north.

III. Development of Culture and Education

This region experienced a cultural leap in the mid to late Northern Song Dynasty:

• Rise of Academies: The White Deer Grotto Academy (Lushan), the Egret Islet Academy (Ji'an), and the Yuelu Academy were renowned as the "Four Great Academies."
• Examination Success: Cultural lineages emerged, such as the Yan Shu family in Hong Prefecture (Nanchang) and the Wang Anshi family in Linchuan.
• Printing Industry: Jianchang Commandery (modern Nancheng) became one of the four major national printing centers, famous for its "Masha editions."

IV. Indirect Connections with the Liao Dynasty

Although not directly bordering the Liao, economic interaction occurred through regulated border markets:

• Porcelain Trade: Celadon from the Hongzhou Kilns was transshipped via the port of Guangzhou to Liao territory.
• Copper Coin Outflow: During periods of "coin shortage" in the Liao, copper coins from the Jiangnan West Route flowed north through smuggling.
• Military Relevance: To guard against potential Liao invasions from the north, the Northern Song established the "Jiangxi Military Command" within the Jiangnan West Route to coordinate military supplies.

V. Finalization of Administrative Divisions

In the 2nd year of the Shaoxing era (1132 AD), the Southern Song adjusted the administrative divisions, transferring Jiang Prefecture and Rao Prefecture from the former Jiangnan East Route to the Jiangnan West Route. This created a pattern largely overlapping with the modern borders of Jiangxi Province. This adjustment was driven both by military defense needs (strengthening control over the middle Yangtze) and reflected the completed economic integration of the Gan River basin.