Wenchang Space Launch Center is China's fourth and southernmost launch site. 

China has three others: Jiuquan, Xichang, and Taiyuan. 

As the only coastal launch site, Wenchang is widely considered the best facility for launching China's largest rocket, the giant Long March-5. 

It is also known as the most beautiful and environment-friendly launch site in China.

CGTN's Wu Lei gets into the site and finds out how waste water from rocket launch has been treated.