Dadeng Subdistrict (Chinese: 大嶝街道; pinyin: Dàdèng Jiēdào) is a group of three islands under the de facto administration of the People's Republic of China as part of Xiang'an District of Xiamen in southern Fujian, but is also claimed by the Republic of China and historically constituted as an insular subdistrict in Kinmen County (Quemoy).

[4][5][6][7] From the Song dynasty to the early Republican China period, the area was part of Xiangfeng Li (翔風里).

[8]: 99  On the day of Qingming Festival in 2005, a monument to the more than 300 PLA soldiers who died during the struggle was erected on Dadeng Island.

[2] On September 3, 1954, fourteen 120mm and 155mm Chinese Communist artillery in Xiamen (Amoy) and Dadeng (Tateng) fired six thousand rounds at the Kinmen (Quemoy) Islands in a five-hour period.

Taipei reported, "great fires at storage points, hundred of junks sunk, and blows at Communist troop concentrations".

[2] During the Second Taiwan Strait Crisis in 1958, the islands were designated by the State Council of the People's Republic of China as the "Hero's Triangle"[17] (英雄三島[1][18]).

[6] At low tide, the coast near Mashan (馬山) in northern Jinsha Township, Kinmen County (Quemoy), ROC (Taiwan) is 1.8 kilometres (1.1 mi) from Jiaoyu.