The Qiongzhou Strait (or 琼州海峡, 瓊州海峽, Hainan Strait) separates the Leizhou Peninsula in Guangdong, China, to the north from Hainan Island to the south. The strait connects the Gulf of Tonkin in the west to the James Shoal on the eastern edge of the South China Sea.
The strait is on average 30 km (19 miles) wide with a maximum water depth of approximately 120 meters (390 ft).
A 140 billion RMB ($21 billion USD) bridge across the strait is planned to begin construction in 2012. The bridge is currently designed to have levels for both trains and cars, and is expected to be 26.3 km (16.3 miles) long. Currently the strait is susceptible to closure during strong typhoon activity.