Qinhuangdao (/ˈtʃinˈhwɑːŋˈdaʊ/) (秦皇岛) is a port city on the coast of China in northeastern Hebei province. It is administratively a prefecture-level city, about 300 km (190 mi) east of Beijing, on the Bohai Sea, the innermost gulf of the Yellow Sea. Its population during the 2010 national census was 2,987,605, with approximately one million people living in the built-up (or 'metro') area made up of three urban districts.
In the 19th century, Qinhuangdao included the separate towns of Qinhuangdao and Tanghe. Both were stations along the Peking–Mukden Railway. The design and construction of the new harbour and port of Ching Wang Tao in the Gulf of Pechili was undertaken by the partnership of Sir John Wolfe-Barry and Lt Col Arthur John Barry at the turn of the 20th century.
Qinhuangdao sits on the northwest coast of the Bohai Sea and borders Tangshan to the southwest, Chengde to the northwest, and Liaoning to the northeast. Its administrative area ranges in latitude 39° 24' to 40° 37' N and in longitude from 118° 33' to 119° 51' E, and has a total area of 7,812.4 km2 (3,016.4 sq mi).
Since the elevation of Tianjin to a provincial-level municipality, Qinhuangdao is the chief port of Hebei. The Qin emperor Qin Shi Huang is said to have sought immortality on an island in the Haigang district but did not find it.
Qinhuangdao has a monsoon-influenced humid continental climate (Köppen Dwa), with four distinct seasons. Winters are cold and dry due to the Siberian high, which often causes winds to blow in from the northwest, minimising the oceanic influence: the monthly daily average temperature in January is −4.8 °C (23.4 °F), colder than Beijing's −3.7 °C (25.3 °F). Summers are hot and humid due to the East Asian Monsoon, often allowing onshore flows; summer is also when the coast moderates the weather the most: the average high temperature in July here is 28.1 °C (83 °F), as compared to 30.9 °C (88 °F) in Beijing. As measured by daily mean temperature, July and August are equally warm, averaging 24.7 °C (76.5 °F). The annual mean is 11.0 °C (51.8 °F), and 70% of the annual precipitation falls from June to August.