China has established and implemented marine ecological conservation red line (MECRL) system to strengthen the bottom line constraints and ensure ecological security. This paper introduces the concept of MECRL and the process of overall consideration of the national MECRL delineation, which is defined “spatial-division + differential control measures”. The MECRL in Bohai Sea pilot and delineation of MECRL nationwide are introduced. At present, MECRL accounts for about 30 percent of the total coastal management area, providing a good institutional guarantee for protecting marine ecology and guiding the good formation of a scientific marine spatial layout in china.
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