Located on the estuary of Yangtze River, Chongming Island is the third largest island in China. Being the largest alluvial island at the estuary of a river and the largest sand island in the world, Chongming Island is also acclaimed as “Door to the Yangtze River, Yingzhou Island (a celestial mountain in fairy tales of ancient China) in the East China Sea”. Chongming Island has been in existence for more than 1,300 years. Now, it covers an area of 1,267 square kilometers (489 square miles), with a population of 635,000.
The whole island is flat in terms of terrain, with fertile soil, luxuriant forests and abundant resources. As a result, Chongming Island has become a famous region where the cultivation of rice and the breeding of fish flourish.
According to a survey by an authoritative institution, the negative oxygen ion amount in the Chongming Island reaches up to 1,000 per cubic centimeter, and more in Dongping National Forest Park between 10,000 and 20,000. In contrast, the negative oxygen ion amount is only between 10 and 20 per cubic centimeter in the public places of the city and between 100 and 200 in the green land of the