Yantai, formerly known as Chefoo, is a coastal prefecture-level city on the Shandong Peninsula in northeastern Shandong province of People's Republic of China. Lying on the southern coast of the Bohai Strait, Yantai borders Qingdao on the southwest and Weihai on the east, with sea access to both the Bohai Sea (via the Laizhou Bay and the Bohai Strait) and the Yellow Sea (from both north and south sides of the Shandong Peninsula). It is the largest fishing seaport in Shandong. Its population was 6,968,202 during the 2010 census, of whom 2,227,733 lived in the built-up area made up of the 4 urban districts of Zhifu, Muping, Fushan and Laishan.
The name Yantai ( (). "Smoke Tower") derives from the watchtowers constructed on Mount Qi in 1398 under the reign of the Hongwu Emperor of the Ming dynasty. The towers were used to light signal fires and send smoke signals, called langyan from their supposed use of wolf dung for fuel. At the time, the area was troubled by the Japanese pirates (Wokou), initially raiders from the warring states in Japan but later principally disaffected Chinese. It was also formerly romanized as Yen-tai.
The major district of Yantai is Zhifu, which used to be the largest independent city in the area. It was variously romanized as Chefoo, Che-foo, Chi-fu, and Chih-fou. Although this name was used for the city by foreigners prior to the Communist victory in the Chinese Civil War, the locals referred to the settlement as Yantai throughout.
During the Xia and Shang dynasties, the region was inhabited by indigenous people vaguely known to the Chinese as the "Eastern Barbarians" (Dongyi). Under the Zhou, they were colonized and sinicized as the state of Lai. Lai was annexed by Qi in 567 BC. Under the First Emperor (Shi Huangdi), the area was administered as the Qi Commandery. Under the Han, this was renamed as the Donglai Commandery (). Following the Three Kingdoms Period, the area was organized by the Jin as the Donglai Kingdom or Principality, later returning to prefecture status as a jùn and then zhōu.