Dashan Island, also known as Danianshan and Taibujiao,^{[citation needed]} is an island in the East China Sea administered as part of Qiansandao, Lianyungang Prefecture, Jiangsu Province, China.

Dashan Island has an area of 0.115 km² (0.044 sq mi). It is part of the Qiansan Islands and is located 28 nmi (52 km) from Lianyungang.

It is one of the baselines of the Chinese territorial sea^[1] and the PLA erected territorial sea steles on the island in 2006.

• Suyanjiao (Suyan Rock)
• Macaiheng
• Waikejiao
• Haijiao
• Baselines of the Chinese territorial sea

• Declaration of the Government of the People's Republic of China on the baselines of the territorial sea(May15th, 1996)
• 中国东海１０座领海基点石碑建成 (in Chinese)
• 中华人民共和国政府关于中华人民共和国领海基线的声明(1996年5月15日) (in Chinese)

35°00′02″N 119°54′12″E / 35.00056°N 119.90333°E / 35.00056; 119.90333