A good example of green infrastructure principles being applied at landscape scale is the Beijing Olympic site.  First developed for the 2008 Summer Olympics but used also for the 2022 Winter Olympics, the Beijing Olympic site covers a large area of brownfield redevelopment in the northern sector of the city between the 4th and 5th ring roads.  The central green infrastructure feature of the Olympic site is the "Dragon-shaped river" – a complex of retention basins and wetlands covering more than a half million square metres configured to look from the air like a traditional Chinese dragon.  
In addition to referencing Chinese culture, the system is capable of significantly reducing nutrient loads from influent waters, which are provided by a nearby wastewater recycling facility.