Dongshan County (simplified Chinese: 东山县; traditional Chinese: 東山縣; pinyin: Dōngshān Xiàn) is a county of southern Fujian province, People's Republic of China, located along the Taiwan Strait. It is under the administration of Zhangzhou City and comprises 44 islands for a total area of 194 square kilometres (75 sq mi). The total population was 200,000.[when?] Dongshan County has jurisdiction over 7 towns, a nationally managed forest and an economic and technological development district. It is considered an important port for international trade and trade with Taiwan
In one of the islands, there are several ancient relics, including the Mountain of the Nine Immortals, and the Dongshan ancient city where two famous Ming Dynasty generals, Qi Jiguan and Zheng Chenggong were based.
There is the ancient Tonghshan Castle situated in Tongling Town on northwestern Dongshan Island. This waterside castle was built of stone in 1387 by Zhou Dexing of the Ming Dynasty to protect against Japanese pirates. The gate tower still stands intact. Inside, there is a path linked by corridors and the exquisite Temple of Guan Yu. The entrance to the temple is flanked by ancient houses, the birthplace of Huang Daozhou, an official of the Ming Dynasty.