The Shandong Peninsula, also known as the Jiaodong Peninsula, is a peninsula in Shandong province in eastern China, marking the southern limit of the Bohai Sea. Cities on the peninsula include Qingdao, Yantai and Weihai.
It was formerly an island, but long ago was joined to the mainland by the Yellow River delta extending.
The local dialect of Mandarin, Jiao-Liao, is also spoken on the Liaodong Peninsula to the north across the Bohai Sea.
The Shandong peninsula formed part of the German concessions in China from 1898 to 1914. During World War I, Japan captured the city of Qingdao (previously held by Germany) on the peninsula in November 1914; Japan had declared war on Germany (August 1914) in terms of the Anglo-Japanese Alliance of 1902.
Coordinates: 37°N 121°E / 37°N 121°E