Hai'an is a town in Xuwen County, Guangdong province, situated at the southern extremity of the Leizhou Peninsula as well as geographic mainland China, facing Haikou on Hainan Island, 29 km (18 mi) away, directly across the Qiongzhou Strait. It is also the southern terminus of China National Highway 207. As of 2011, it has two residential communities (社区) and five villages under its administration.