Editor's note: As protection of the planet's flora, fauna and resources becomes increasingly important, China Daily is publishing a series of stories to illustrate the country's commitment to safeguarding the natural world.

The Lianjiang River, named for its clear, silk-like waters, originates in Puning of the city of Jieyang in Guangdong province, and empties into Haimen Port in the Guangdong city of Shantou. Running 71.1 kilometers, it supports a population of approximately 5 million.

During the economic boom of the late 20th century, the river's water quality deteriorated due to industrial pollution and increased population density, leading to the disappearance of aquatic life and earning it the reputation of being one of Guangdong's most polluted rivers.