Dongshan County is administered under Zhangzhou City, Fujian Province, and is situated along the southern coast of Fujian, between the two Special Economic Zones of Xiamen and Shantou. It faces the Taiwan Strait to the east, looking across the sea towards Taiwan, borders the Chaoshan region of Guangdong Province to the south, adjoins Zhao'an County to the west, and is bounded by Zhangpu County to the northeast. The county falls within a subtropical oceanic monsoon climate zone. Its land area is 243.4 square kilometres, with a maritime area of approximately 1,845.72 square kilometres. As of the end of 2023, the resident population of Dongshan County stood at 220,700. As of August 2023, the county administers seven townships, with the County People's Government seated at No. 3, Xianfu Road, Baishi Street, Xipu Township.
Dongshan County has a deep and rich historical heritage. It is the birthplace of the literary scholar Huang Daozhou; a site where the general Qi Jiguang garrisoned troops and trained his forces in his campaigns against Wokou pirates; the place of departure from which Zheng Chenggong (Koxinga) and Shi Lang launched their expeditions to recover Taiwan; and the birthplace of the Gu Wenchang spirit *. The county is home to a wealth of prehistoric remains and distinctive cultural resources, including the Guan Di culture, the Dongshan Land Bridge, and the Austronesian peoples heritage. It holds the designation of "Outstanding Tourism County of China."
Dongshan County is the sixth largest island county in China and the second largest in Fujian, encompassing 66 outlying islands and more than ten crescent-shaped bays, endowed with exceptional natural resources. Across the island, the terrain is higher in the northwest and lower in the southeast, with rolling low hills to the northwest and stretches of aeolian sandy land to the southeast. The landscape is deeply dissected and undulating, with 413 hillocks, the highest being Sufeng Mountain at 274.3 metres above sea level. There are no major rivers, only a few streamlets of less than five kilometres in length. The coastline is sinuous, measuring 141 kilometres. The county has numerous bays and extensive areas of tidal flats and maritime waters. The waters surrounding Dongshan Island are scattered with islets and reefs, and are home to the northernmost hard coral reefs of the South China Sea, forming a unique northernmost-margin coral ecosystem with a total area of 3,680 hectares.
* Gu Wenchang (1915–1981) served as the Communist Party Secretary of Dongshan County from 1950 until his death. He is celebrated for leading the people of Dongshan in a decades-long campaign to combat the severe desertification that had laid waste to the island, famously vowing that if he could not tame the encroaching sands, he would rather be buried beneath them. Through persistent afforestation efforts, he oversaw the transformation of a near-barren island into a verdant landscape, raising forest coverage from a fraction of one percent to over ninety percent. Remembered for his integrity, frugality, and selfless dedication to the long-term welfare of the people he served, he is venerated by the people of Dongshan to this day. His legacy has been held up as a model of exemplary governance throughout the People's Republic of China.Dongshan was originally known as Tongshan at the beginning of the Ming dynasty. The Zhao'an County Gazetteer records: "The fortified city of Tongshan was originally pastoral and common land, locally known as 'Dongshan'." The Tongshan Garrison Gazetteer records: "Tongshan was a Ming dynasty naval garrison established to defend against the Wokou. Surrounded on all sides by the sea, it stands to the east of the Fifth District, and was originally called 'Dongshan'." In the twentieth year of the Hongwu reign (1387), the Marquis of Jiangxia, Zhou Dexing, constructed city walls, established a naval garrison, and set up a Thousand-Household Guard at Dongshan to strengthen coastal defences against the Wokou. As the site was connected to Tongbo in the Fifth District, the name was changed to Tongshan, and henceforth the city, the garrison, and the guard post all bore the name "Tongshan." This place name endured for more than five hundred years. When "Tongshan" was elevated to county status, however, the ancient name was restored and the county was designated Dongshan, as a county by the name of Tongshan already existed in Jiangsu Province.
The veneration of Guan Di in Dongshan traces its origins to the third year of the Zongzhang reign of the Tang dynasty (668 AD), when Chen Zheng and his son Chen Yuanguang led soldiers of 58 clans southward to open up and settle southern Fujian. To rally and comfort the hearts of their troops, they brought with them the incense fire of Guan Gong from their ancestral homeland in Henan, in the Central Plains. In Tongshan, a major coastal stronghold on the southern Fujian maritime frontier, the image of Guan Gong became deeply revered among the troops, and this tradition was perpetuated through successive generations.
Following ancient custom, on the twentieth day of the twelfth lunar month each year, the people of Dongshan reverently bid farewell to Guan Di as he ascends to Heaven, and on the fourth day of the first lunar month of the New Year, they solemnly welcome his return. On the stroke of midnight on the fifth day of the first lunar month, a ceremony is held to reinstate Guan Di in his rightful place. Upon the conclusion of the rites, the county magistrate would offer the first stick of incense, draw the first divination lot, and seek divine guidance on matters of agriculture, industry, and fisheries, as well as the peace and well-being of the people, praying for blessings and the averting of calamity. Only after the magistrate had completed his prayers would the people proceed with their own divinations. Following the incorporation of Dongshan into the People's Republic of China, this custom was slightly modified: a respected elder of high standing in the local community now offers the first stick of incense and draws the first lot on behalf of the people of the county, praying for blessings and the averting of calamity for all.