1962 what is the mystery of the ancient well of the southern song dynasty discovered in nan' ao island, Guangdong province?

In ancient times, fresh water resources were extremely scarce. Due to the limited productivity of science and technology, the freshwater resources of South Australia Island are as precious as the "golden edition". However, more than 700 years ago, a magical ancient well dug on Nan 'ao Island was often submerged by seawater because it was close to the coastline. However, in the history of more than 700 years, this ancient well is still sweet, without a trace of salty seawater.

Nan 'ao Island is the main body of the only island county in Guangdong Province, and Nan 'ao County is the only county under the jurisdiction of Shantou City. Nan 'ao Island is located in the sea area at the junction of Guangdong, Fujian and Taiwan Province provinces. It is surrounded by the sea and has been isolated from the world since ancient times. It consists of Nan 'ao Island and 33 surrounding islands, and is an "oasis" in the South China Sea.

Nan 'ao Island has traces of human life since ancient times, which can be traced back to the "Xiangshan Culture" 8,000 years ago. These are all historical records. The earliest Neolithic cultural remains were discovered in Nan 'ao Island, about 8,000 years ago, which is also recognized as the "Xiangshan Culture" period in our human history.

The most detailed historical record of Nan 'ao Island is the Song Dynasty. This magical ancient well on Nan 'ao Island was dug in the Southern Song Dynasty, and it is also the most famous scenic spot on Nan 'ao Island-Matsui. From this name, we can know that the ancient well was dug in the Song Dynasty. According to records, at the end of the Southern Song Dynasty, namely 1276, the first year of Jingyan in the Southern Song Dynasty, the Southern Song Dynasty had to withdraw from Lin 'an, the capital city, and return to Nan 'ao Island all the way to stay in the original Australian village. Because when emperors, ministers and terracotta warriors and horses came to the island, there were fresh water resources, and then the fresh water resources on the island were extremely scarce, so it was urgent to dig a fresh water well.

Under the leadership of Assistant Minister Lu Xiufu and General Zhang Shizhong, three wells "Longjing, Hu Jing and Ma Jing" were dug in Aoqian Village, Nan 'ao Island, which are only 10 meter away from the coastline. Due to the long history, only one ancient well, Ma Jing, has been discovered, and the other two have not been discovered so far. At high tide, Ma Jing is soaked in seawater almost every day. In our impression, fresh water soaked in seawater will have salty taste, but Ma Jing is quite magical. After the tide recedes, it is still clear and sweet, which can be described as a "magical ancient well".

Why in the history of more than 700 years, the horse wells dug along the coastline 10 meters are often soaked in seawater and still sweet? In fact, the wisdom of the ancients is infinite. They dug an ancient well on a rock along the coastline, but the spring here is on the mountain, and the spring here is constant all the year round. Just at the bottom of this rock, the rock can stop the complete penetration of seawater, so when the tide comes in, the seawater will be diluted by a steady stream of spring water before long, so the spring water in Ma Jing is still pure and sweet.