According to the records in Zheng Deqiong's Records of Taiwan in Ming Dynasty, Hainan Island was called "Southern Service and Waste Payment" in Tang and Yu Dynasties, and "Outside the County" in Qin Dynasty. This shows that Hainan Island was a remote border of the motherland at that time. Hainan Island is one of the four exile places, mainly in Asia, located at the southernmost tip of China.

In the thirty-third year of Qin Shihuang (2 14 BC), the vast area of Lingnan was unified, and Guilin County, Nanhai County and Xiang County were established in the south, and hundreds of thousands of people from the Central Plains moved here. At that time, Hainan Island was outside Xiang Jun. At the turn of Qin and Han Dynasties, the Central Plains was in war, and Qin Longchuan made Zhao Tuo the king of South Vietnam. The forces of South Vietnam are all over Hainan Island.

Extended data:

Hainan Island is the largest "tropical treasure land" in China, with a total land area of 3.442 million hectares, accounting for 42.5% of the national tropical land area. The land available for agriculture, forestry, animal husbandry and fishery is about 0.48 hectares per capita.

Due to the superior light, heat and water conditions, the growth and reproduction rate of organisms are better than those in temperate and subtropical regions. Farmland can be planted all year round, and many crops can be harvested two or three times a year. According to suitability, land resources in Hainan Island can be divided into seven types: suitable cultivated land, suitable rubber land, suitable hot land, suitable woodland, suitable grazing land, water surface land and other land.

Hainan Island has about 3152,000 hectares of developed land and about 260,000 hectares of undeveloped land, of which about 90% can be used for large-scale agricultural development. Hainan is rich in land reserve resources and has great development potential.

Baidu Encyclopedia-Hainan