If it is a city, it is as follows:
During the Qin and Han Dynasties, the sea salt territory included a small part of southwest Shanghai, southwest Fengxian County (all referring to the west of Gugang), southeast Songjiang County, the whole territory of Jinshan County, the whole territory of Pinghu County in Zhejiang Province and some areas of Haining County. Referring to many ancient books, the surrounding boundaries are: West Songjiang (now Wusong River) in the north of Haiyan County, with the river as the boundary, and Jiangbei is Gulou County in Qin Dynasty. It is recorded in the Records of Haiyan County in Jiajing of Ming Dynasty and Guangxu of Qing Dynasty. Today Songjiang (county name) is 60 miles northeast of Hudu (water name), and old Haiyan is in the northeast (east extension). Liang Xiaogang (later) in the Southern Dynasties wrote: "Louxian, Wuxian: Songjiang (Wusongjiang), named Hudu." In the morning, the lakes are all downstream of the ancient Songjiang River, which flows directly eastward into the sea and is the dividing line between ancient Haiyan County and Gulou County. Haiyan is adjacent to the sea in the east, and the coastal area (now called "ancient harbor depth") extends from Jiading and Waigang to the east of Caojing, to the north of Gusong River and to the east of Zhelin in the south. The southeast line faces the sea. The coast protrudes in an arc from the south of Zhelin (now in the middle of the sea) to the southwest, passes through the south of Dajinshan, then twists and turns, and the apex passes through the south of Panshan Mountain (also known as Fushan Mountain and Panyushan Mountain) in Wang Huang, ending in Ganpunan. There are seventy-two bays on the ancient coast. Southwest, from Ganpu south to ancient Qiantang county boundary through Zheshan south. Southwest, west and northwest, from Zhekou and Zheshan in Guqiantang County to the north, the narrow path goes around Shi Xia in the south (which was under the jurisdiction of the county in ancient times), then turns to the northeast (which is adjacent to the county in ancient times in the west), passes through Songjiang County today, and is "east of Sancha" in the northwest (Sancha is an ancient Changshui County, and the ancient Dongjiang River enters the sea.
Since the end of the Eastern Han Dynasty (Sun of the Three Kingdoms), the Tang Dynasty and the Ming Dynasty were divided into three counties: Haichang (now Haining), Huating and Pinghu. At the end of the Eastern Han Dynasty, Sun Wu lived in the east of the Yangtze River. From five to eight years of Jian 'an (200-203), Haiyan County was located in the southwest and Haichang County was located in the south of the county. According to the "Haiyan County Records" to be published tomorrow, "Haining today belongs to Zhekou Mountain, with a border in the west and a sea in the east, reaching Huangwan and Wulong. Zheshan and Bokou are the junction of ancient Qiantang County and ancient Haiyan County. It starts from Zhekou and Zheshan, narrows to the west, connects Zibian (Shixia Mountain), extends eastward with sea level, and reaches between Huangwan and Wulong, which used to be the southwest of ancient sea salt.
In 507, Haiyan County was located in the northeast of the county. Today, the area east of Zhangjing River belongs to Qianjing County, which is under the jurisdiction of the northern foot of Jinshan Mountain. Tian Liang, the base city of Haiyan County, has been under supervision for seven years. The original Jingxian County was placed under Xinyi County, the late Liang Dynasty and the early Chen Dynasty belonged to Wuxian County, and later to Haining County. When the abandoned Haining County was Yan Guan County, the original capital was returned to Haiyan County, and the two counties were merged into Yan Guan County, which belonged to Hangzhou. From the sixth year of Liang Datong to the first year of Datong (534-535), Haiyan County was placed under Xupu County in Northeast China. The county seat is located in Xupuli (near Ganxiang Town, Jinshan County). Its area is in the east of Zhangjing, in the west of Changyang, in the north of Hengliaojing (now in the north of Maogang Township, Songjiang County), in the southeast of Shanghai, about a little south of Tang Han Haitang. Xupu County was initially assigned to Wuxian County. In June of the third year of Taiqing (549), it belonged to Wuyuan County. Counties searched for provinces, and at the latest in the second year of Chen Yongding (558), the base area was merged into Qianjing County (once said to be the northeast of Haiyan), and then Qianjing County was returned to Haiyan County.
In the tenth year of Tang Tianbao (75 1), Zhao Juzhen, the magistrate of Wu County, cut the northern border of Haiyan, the eastern border of Jiaxing and the southern border of Kunshan, and set up Huating County (that is, Qingpu, Songjiang, Jinshan, Fengxian, Nanhui and Shanghai were all located in Songjiang County in the Tang Dynasty), which belonged to Wu County. Ming "Haiyan County Atlas" said: "Tang Huating is now the whole county of Songjiang. 160 in the east and 173 in the north and south. It is not full of sea salt, but most of it is sea salt ... I heard that there is a XX well in the south gate of Huating, and the word Haiyan County is engraved on the stone. So far, Songzhi City is a saltworks, especially. " After the analysis of Huating County, the northern boundary of Haiyan County immediately became the common boundary of the old Songjiang Prefecture, excluding Jiaxing Prefecture (that is, the common boundary of Jiangsu and Zhejiang Provinces today).
In the fourth year of Xuande in Ming Dynasty (1429), in March, both the governor and Dali Temple were rich in county fields, and they wrote to Zeng County. On March 28th of the following year, they divided Haiyan County into four counties: Wuyuan, Qi Jing, Huating and Dayi, and set up Pinghu, which is the capital of Danghu Town and belongs to Jiaxing Prefecture.
1950 in may, three villages (10,1,12) were included in haining county, and ten villages in Qilian township of Pinghu county were included in Tong Yuan township of Haiyan county. 196 1 year1February 15 When Haiyan County was restored, Shiling Commune remained in Haining County. In recent years, the situation in Haiyan County has not changed.
So to sum up, sea salt has a long history, dating back to the Qin Dynasty, which should be more than 2,200 years old.
As for the salt extracted from seawater, it has been explained upstairs.
Hope to adopt.