Rudong County, under the jurisdiction of Nantong City, Jiangsu Province, is located in the southeast of Jiangsu Province and the north wing of the Yangtze River Delta. The county borders Tongzhou District in the south, Rugao City in the west, Hai'an City in the northwest, and the Yellow Sea in the east and north. The land area is 2122 square kilometers, and the sea area under its jurisdiction is 4965 square kilometers. By the end of 2021, the county has 3 streets and 12 towns.

Rudong is the representative of Jianghai salt reclamation culture. Before the Qin and Han Dynasties, the county was a sandbar at the mouth of the Yangtze River, so it was called Fuhaizhou. After the Yangtze River and the Huanghuai River were alluvial into land, the Rudong salt industry rose, and there were numerous kiosks, which flourished in the Ming and Qing dynasties. After the Republic of China, the coastal areas were gradually abandoned and cultivated. After the founding of the People's Republic of China, modern agriculture and fishery have been developed. After the opening up in 1988, the economy and society continued to develop and entered the top 100 counties in the country.

By the end of 2021, Rudong County has a permanent resident population of 879500. In 2021, Rudong County achieved a GDP of 127224 million yuan. From the perspective of industry, the added value of the primary industry is 9.604 billion yuan, the added value of the secondary industry is 63.278 billion yuan, the added value of the tertiary industry is 54.342 billion yuan, and the tertiary industrial structure is 7.5:49.7:42.7. According to the resident population, the per capita GDP is 144597 yuan.