Xuwen County, belonging to Zhanjiang City, Guangdong Province, is located in the southernmost part of mainland China, facing the Qiongzhou Strait in the south, facing Hainan Island across the sea, bordering the South China Sea in the east, the Beibu Gulf in the west, and bordering Leizhou City in the north. It lies between 109°52′ and 110°35′ east longitude and 20°13′ and 20°43′ north latitude, with a total land area of 1979.6 square kilometers. Xuwen County has a tropical monsoon climate with abundant sunshine and abundant solar radiation energy. As of 2018, Xuwen County has 1 street, 12 towns and 2 townships under its jurisdiction, as well as 4 farms and 1 state-owned enterprise. It is a pilot of fiscal reform in directly administered counties in Guangdong Province. According to the seventh population census, as of 00:00 on November 1, 2020, Xuwen County had a resident population of 633,258 people. Since ancient times, Xuwen County has been an important place for soldiers to station and merchants to travel, so Su Dongpo said, "The people of the four states take Xuwen as their throat." It is the "starting port of the Maritime Silk Road in Han Dynasty".