There are several islands of Shanghai governed by Shanghai

Shanghai

Shanghai is the largest city by population in China and the largest city proper in the world. It is one of the four province-level municipalities in the People's Republic of China, with a total population of over 23 million as of 2010...

 city, including the three larger inhabited islands and a number of uninhabited ones. They are alluvial islands in the Yangtze River Delta

Yangtze River Delta

The Yangtze River Delta, Yangtze Delta or YRD, also called Yangzi, or Chang Jiang Delta, Rive Chang Delta Tai Lake Region or the Golden Triangle of the Yangtze, generally comprises the triangular-shaped territory of Wu-speaking Shanghai, southern Jiangsu province and northern Zhejiang province of...

 in China

China

Chinese civilization may refer to:* China for more general discussion of the country.* Chinese culture* Greater China, the transnational community of ethnic Chinese.* History of China* Sinosphere, the area historically affected by Chinese culture...

.

Chongming Island

Chongming Island 31°37′06"N 121°33′12"E lies against the northern shore of the Yangtze River

Yangtze River

The Yangtze, Yangzi or Cháng Jiāng is the longest river in Asia, and the third-longest in the world. It flows for from the glaciers on the Tibetan Plateau in Qinghai eastward across southwest, central and eastern China before emptying into the East China Sea at Shanghai. It is also one of the...

 and is an alluvial island formed by silt

Silt

Silt is granular material of a size somewhere between sand and clay whose mineral origin is quartz and feldspar. Silt may occur as a soil or as suspended sediment in a surface water body...

 carried along the river. It gives the name to Chongming County, the only county of Shanghai

Shanghai

Shanghai is the largest city by population in China and the largest city proper in the world. It is one of the four province-level municipalities in the People's Republic of China, with a total population of over 23 million as of 2010...

. It is the second largest island in China after Hainan Island. The other two inhabited Shanghai islands are Changxing Island at 88.54 km² (34.2 sq mi), and Hengsha Island at 55.74 km² (21.5 sq mi). The 25.5 km (15.8 mi) Shanghai Yangtze River Tunnel and Bridge joining the island to Shanghai opened on 2009-10-31. The island will be connected to Jiangsu Province

Jiangsu

' is a province of the People's Republic of China, located along the east coast of the country. The name comes from jiang, short for the city of Jiangning , and su, for the city of Suzhou. The abbreviation for this province is "苏" , the second character of its name...

 via Chonghai Bridge

Chonghai Bridge

Chonghai Bridge is a bridge, located at , spanning the northern distributary of the Yangtze River in China that is currently under construction...

 which has not been built yet and Chongqi Bridge

Chongqi Bridge

Chongqi Bridge , also called Chongqi Crossing Project , is a part of the Hushan Expressway , which is one part of the National Expressway Network of the People's Republic of China....

 which will be finished in 2012.

Jiuduansha Island

Jiuduansha Island (31°10′N 121°55.5′E; total area: 423.2 square kilometres (163.4 sq mi), 114.6 square kilometres (44.2 sq mi) above sea level) has the national nature reserve

Nature reserve

A nature reserve is a protected area of importance for wildlife, flora, fauna or features of geological or other special interest, which is reserved and managed for conservation and to provide special opportunities for study or research...

, Jiuduansha Wetland. It is an intertidal wetland

Intertidal wetland

An intertidal wetland is a the area along a shoreline that is exposed to air at low tide and submerged at high tide. This type of wetland is defined by an intertidal zone and includes its own intertidal ecosystems.-Description:...

 which consists of three parts, Shangsha, Zhongsha and Xiasha.

Dajinshan Island

Dajinshan Island (Big Jinshan Island), Xiaojinshan Island (Small Jinshan Island), and Fushan Island in Jinshan District

Jinshan District

Jinshan District of Shanghai is neighbouring Zhejiang and near Hangzhou Bay. It has a land area of 586.14 km² and a population 536,900 as of 2001....

are nature reserves under city jurisdiction. Dajinshan has the highest point in Shanghai with an altitude of 103.4 metres (339.2 ft).

Some alluvial islands are relatively young and the number varies over time. For example, Jiuduansha emerged in the 1950s. In 2006, the city had 19 uninhabited islands covering 226.27 square kilometres (87.4 sq mi), with a total coastline length of 309 kilometres (192 mi).