The Shandong (Shantung) Peninsula or Jiaodong (Chiaotung) Peninsula is a peninsula in Shandong Province in eastern China, between the Bohai Sea to the north and the Yellow Sea to the south. The latter name refers to the east and Jiaozhou. Geography The waters bordering the peninsula are Laizhou Bay to the northwest, which opens into the Bohai Sea to the north, which in turn passes through the Bohai Strait to the northeast into the Yellow Sea to the east and south. The peninsula's territory comprises three prefecture-level cities of Shandong: Qingdao in the southwest, Yantai in the north and centre, and Weihai at the eastern tip. Shandong Peninsula is the largest peninsula in China. Stretching into the Bohai Sea and the Yellow Sea, it is 290 kilometers long from east to west, 190 kilometers wide from north to south, and 50 kilometers narrow. The total area of Shandong Peninsula is 73,000 square kilometers. Geologically it was once connected to the Korean Peninsula and the Liaodong Peninsula, but was split starting around 27 Ma ago, resulting in the formation of the Yellow Sea. History In the Paleolithic, the Shandong Peninsula area was covered by forest. In the Neolithic, about 7,000 years ago, a large number of Dongyi people inhabited the peninsula. The peninsula later belonged to the Shang dynasty. The State of Qi built the Great Wall of Qi, which is partially on the peninsula. The Kiautschou Bay Leased Territory was a leased territory of the German Empire from 1898 to 1914 located around Jiaozhou Bay, where the village of Qingdao (Tsingtao) developed into a major seaport. Japan seized the territory from Germany in 1914 in the First World War. In the 1919 Treaty of Versailles, Germany lost Qingdao and its sphere of influence in Shandong. Instead of restoring Chinese sovereignty over the area, the treaty transferred the leased territory to the Empire of Japan. This resulted in popular dissatisfaction with the outcome, known as the Shandong Problem, and led to the May Fourth Movement. Eventually, Shandong was reverted to Chinese control in 1922 after mediation by the United States during the Washington Naval Conference. However, Japan retained economic influence in the area. Due to geographical reasons, the Shandong Peninsula is closely connected with Northeast China and South Korea. Historically, a large number of people migrated to the Northeast by boat, whereas in the present day many people from the Northeast