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An aerial view shows a section of Hong Kong–Zhuhai–Macau Bridge (HZMB) in Hong Kong, China.

The Hong Kong–Zhuhai–Macau Bridge (HZMB) is a 55-kilometre (34 mi) bridge–tunnel system consisting of a series of three cable-stayed bridges, an undersea tunnel, and four artificial islands. It is both the longest sea crossing and the longest open-sea fixed link in the world. The HZMB spans the Lingding and Jiuzhou channels, connecting Hong Kong, Macau, and Zhuhai—three major cities on the Pearl River Delta.

The HZM Bridge was designed to last for 120 years and cost 127 billion yuan (US$18.8 billion) to build. The cost of constructing the Main Bridge was estimated at 51.1 billion yuan (US$7.56 billion) funded by bank loans and shared among the governments of mainland China, Hong Kong and Macau.