Is this the World's Most Chill City?

Sparkling lake, verdant shoreline, swimming fish in the shallow water, bustling tourists, flying egrets... China's Xiamen is a city of leisure and comfort. Stuart, a British vlogger who lives in China, found a treasured place to play and unwind - Yuandang Lake.

You would never have imagined that Yundang Lake, which is now rippling with blue waves, was once a disgusting stinky lake. What has happened here in the past 30 years? Follow Stu to find out!