(洋山港), or Yangshan Deep-Water Port (洋山深水港), is a deepwater port for container ships in Hangzhou Bay south of Shanghai.
Built to allow the Port of Shanghai to grow despite shallow waters near the shore, it allows berths with depths of up to 15 metres (49 ft) to be built, and can handle today's largest container ships. The port is built on the islands of Greater and Lesser Yangshan, part of the Zhoushan archipelago, with fill from land reclamation.
It is connected to the mainland via the 32.5 km (20.2 mi) Donghai Bridge, opened on 1 December 2005 as the world's longest sea bridge. The six-lane highway bridge took 6,000 workers two and half years to construct.
In mid-2011, port officials said the port was on track to move 12.3 million TEUs during the year, up from 10.1 million TEUs in 2010.