According to the "Guidelines on Drawing Up and Safeguarding Ecological Red Line," the Beijing-Tianjin-Hebei region, together with the regions along the Yangtze River Economic Belt, need to draw up a "red line" for ecological protection by the end of 2017, while other areas should come up with a "red line" before the end of 2018.
The Beijing-Tianjin-Hebei region and the regions along the Yangtze River Economic Belt are under China's two key development strategies, and the decision to draw up the ecological red lines are deemed complementary to the strategies.
The red lines are based on China's administrative divisions, but will eventually ensure the completeness of the ecological system across the country.