San Francisco, officially the City and County of San Francisco, is the cultural center and a leading financial hub of the San Francisco Bay Area and Northern California. Wikipedia

Yantai, formerly known as Chefoo or Chih-fou, is a prefecture-level city in northeastern Shandong province, People's Republic of China. Located on the Bohai Strait and the southern coast of the Korea Bay, Yantai borders the cities of Qingdao and Weihai to the southwest and east respectively. Wikipedia