Penglai City (Chinese: 蓬莱市; pinyin: Pénglái Shì), is a port, a town and an administrative subdivision of the prefecture-level city Yantai in Shandong Province, northeastern China. The port was formerly called Dengzhou (Chinese: 登州; pinyin: dēngzhōu; Wade–Giles: Teng-chou). 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). There is a plank walk along the cliffs nearby.