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.
Geologically, basalt terraces account for 43% of the peninsula's area. The rest is divided up between marine terraces (27%) and alluvial plains (17%). Leizhou Peninsula is dotted with a few inactive volcanoes, beaches and low-lying diluvial plains.