One of the four, the Xinghua Duotian Irrigation and Drainage System, located in the eastern Jiangsu province, waters arid uplands with the likes of dykes, channels and water gates.
All of Asia's wild cattle species are now threatened with extinction, with some already declared as critically endangered.
Heyuan is home to at least five dinosaur species and one of the few places where dinosaur eggs, bones and footprints were discovered.
Zhi, a professor of conservation biology said, “Apart from protecting animals and the environment, we need to pay attention to the people who [also] share the natural…
“Thanks to the giant pandas, we are establishing more cooperative exchanges with Hong Kong, especially in breeding,” said an expert.
Some businesses have already started selling the fruit online, hoping to carve out a new local specialty to join the sudachi Japanese citrus.
One of the city's favorite seafoods, oysters are also natural filterers, with just one oyster capable of filtering 200 liters of water per day.
Most experts see Trang An in Ninh Binh as a model for how conservation and development can work hand in hand.
From the get-go, visitors are treated to a breath of fresh air down south.
The Yangtze finless porpoise, which is under top-level state protection, is an important indicator of China’s Yangtze River ecology.