The Qiongzhou Strait, also called the Hainan Strait, is the Chinese strait that separates Guangdong's Leizhou Peninsula from the island province of Hainan. It connects the Gulf of Tonkin on its west to the South China Sea on its east. The strait is on average 30 km (19 mi) wide with a maximum water depth of approximately 120 m (390 ft). The strait is susceptible to closure during strong typhoon activity. Whales and dugongs were once common in the strait.[citation needed] From Wikipedia
