Abstract
Rights and interests concerning the continental shelf beyond 200 nautical miles (extended continental shelf, ECS) are related to important aspects of a nation's marine utilization such as marine resource development, marine technological innovation, and the construction of marine ecological civilization. China is a country with a long coastline and has the right to delineate large areas of ECS according to the United Nations Convention on the Law of the Sea (UNCLOS). However, the process of confirming China's ECS rights under international law is particularly complicated owing to the complex maritime delineation disputes between China and its neighboring countries. From the perspective of international law, this study uses the method of historical analysis and case analysis to retrospectively explore the evolution of the international legal frameworks governing ECS and analyze its current characteristics and trends in practice. On this basis, the paper evaluates the major challenges of China's national practice in ECS delineation and puts forward suggested countermeasures for safeguarding its legitimate rights and interests related to ECS.