Video of world's longest sea bridge opened in China. The world's longest bridge over sea water has opened in opened to general traffic on in China's eastern coastal city of Qingdao. Jiaozhou Bay is located on the southern coast of the Shandong Peninsula in East China. It separates Huangdao District from Qingdao City and borders on two other cities, Jiaozhou and Jiaonan. The Qingdao Haiwan Bridge, with a total length of 42.4 kilometres would easily cross the English Channel and is almost three miles longer than the previous record-holder, the Lake Pontchartrain Causeway in the American state of Louisiana. Built in just four years at a cost of 55.5 billion pounds, the sheer scale of the bridge reveals the advances made by Chinese engineers in recent years.