Penglai (simplified Chinese: 蓬莱; traditional Chinese: 蓬萊; pinyin: Pénglái), is a port, county-level city and an administrative subdivision of the prefecture-level city Yantai in Shandong Province, People's Republic of China, on the northeastern (Bohai Sea) coast of the province. The port was formerly called Dengzhou (Chinese: 登州; pinyin: Dēngzhōu; Wade–Giles: Teng¹-chou¹). Penglai Water City or Water Fortress (Chinese: 水城; pinyin: Shuíchéng), a fortified harbor hidden from the sea, is one of China's oldest military ports, built in 1376 under the Ming Dynasty and is a protected historical monument. It was "the harbor for the fleet of imperial war junks and town for the semi-imperial garrison." The Water City is currently being rebuilt at a cost of 500 million yuan (more than 60 million dollars).