The Jiangxi–Fujian Soviet (commonly called the Jiangxi Soviet) was the largest component territory of the Chinese Soviet Republic, an unrecognized state established in November 1931 by Mao Zedong and Zhu De during the Chinese civil war. Geographically, the Jiangxi–Fujian Soviet occupied China's Jiangxi and Fujian provinces and was home to the town of Ruijin, the county seat and headquarters of the Chinese Soviet government.
The Jiangxi-Fujian base area was defended ably by the First Red Front Army but in 1934 was finally overrun by the Kuomintang government's National Revolutionary Army in the Fifth of its Encirclement Campaigns. This last campaign in 1934-35 precipitated the most famous of the grand retreats known collectively as the Long March.
On November 7, 1931, the anniversary of the 1917 Russian Bolshevik Revolution, the Soviet Union helped organize a National Soviet People's Delegates Conference in Ruijin (瑞金), Jiangxi province. Ruijin was the county seat, and was selected as the capital of the new Soviet republic. "Chinese Soviet Republic" (Chinese: "中華蘇維埃共和國") was born, even though the majority of China was still under the control of the nationalist Government of the Republic of China. On that day, they had an open ceremony for the new country, and Mao Zedong and other Communists attended the military parade. Because it had its own bank, printed its own money, collected tax through its own tax bureau, it is therefore considered as the beginning of Two Chinas.
Jiangxi (Chinese: 江西; pinyin: Jiāngxī; Wade–Giles: Chiang1-hsi1; Gan: Kongsi) is a province in the People's Republic of China, located in the southeast of the country. Spanning from the banks of the Yangtze river in the north into hillier areas in the south and east, it shares a border with Anhui to the north, Zhejiang to the northeast, Fujian to the east, Guangdong to the south, Hunan to the west, and Hubei to the northwest.
The name "Jiangxi" derives from the circuit administrated under the Tang dynasty in 733, Jiangnanxidao (江南西道, Circuit of Western Jiangnan; Gan: Kongnomsitau). The short name for Jiangxi is 赣 (pinyin: Gàn; Gan: Gōm), for the Gan River which runs across from the south to the north and flows into the Yangtze River. Jiangxi is also alternately called Ganpo Dadi (贛鄱大地) which literally means the "Great Land of Gan and Po".
Jiangxi is centered on the Gan River valley, which historically provided the main north-south transport route of south China. The corridor along the Gan River is one of the few easily traveled routes through the otherwise mountainous and rugged terrain of the south-eastern mountains. This open corridor was the primary route for trade and communication between the North China Plain and the Yangtze River valley in the north and the territory of modern Guangdong province in the south. As a result, Jiangxi has been strategically important throughout much of China's history.