Leizhou Peninsula (simplified Chinese: 雷州半岛; traditional Chinese: 雷州半島) is the third largest peninsula in China with an area of circa 8,500 square kilometer located on the southwestern end of Guangdong, with the Gulf of Tonkin to the west and the 30 km wide Qiongzhou Strait to the south, separating the peninsula from Hainan Island. It is the most southerly point of China on the continent.
Critically endangered North Pacific Right Whales and western Gray Whales, and Humpback Whales were once known to occur around the peninsula in the winter and spring to calve. Waters such as Wailuo Harbour were ideal habitats for these giants. These whales were heavily hunted and were wiped out by Japanese whalers in this regions (Japanese whalers established whaling stations on various sites on Chinese and Korean coasts including on Island of Hainan and at Daya Bay). Dugongs still occur in small number.
The peninsula lies in tropical South China. The region is under the influence of continental northeastern monsoons and maritime southeastern and southwestern monsoons. Typhoons occasionally occur, both from the Pacific Ocean and the South China Sea. Annual precipitation is 1400–1700mm.