Why were ancient prisoners always sent to Lingnan? Where is the specific location?

The specific location is in the Red River Delta of Guangdong, Guangxi, Hainan and Viet Nam, which once belonged to the rule of China Dynasty for the following reasons:

Lingnan was sent because it was a wild place at that time, with poor natural conditions and hot climate, and it was difficult for people sent there to survive. Since they were prisoners, since they violated the criminal law of exile, why did the Tang Dynasty tolerate their life and death?

Administratively, Lingnan was once the name of Lingnan Road in the Tang Dynasty, which was equivalent to the whole territory of Guangdong, Guangxi and Hainan and the Red River Delta in Vietnam, and once belonged to the rule of the Chinese dynasty. Later, it was divided into Lingnan East Road and Lingnan West Road, which was the beginning of the division of Guangdong and Guangxi. During the Five Dynasties, Vietnam was separated independently. In the fourth year of Song Chunhua (993), Lingnan Road was renamed Guangnan Road.

Extended data:

There are a large number of people living in Lingnan area for a long time with a long history. This is the Yue nationality mentioned in the history books. The Yue nationality is called "Baiyue" because of its numerous races and great tribal differences.

In the description of Central Plains literature, Lingnan brought advanced technology to southern Qin Jun before it merged into civilization. However, in recent years, the archaeological community has found that this view is a "historical misunderstanding". Since modern times, a large number of bronzes, pottery, crystals and other cultural relics have been unearthed one after another, which proves that Lingnan had splendid Neolithic and Bronze Age civilizations before Qin Dynasty, and Lingnan is one of the cradles of Chinese civilization.

Baidu Encyclopedia-Lingnan