Drawing the U-Shaped Line

Abstract

This article examines the genesis, usage, and meaning of the People’s Republic of China’s and the Republic of China’s U-shaped line claim in the South China Sea territorial dispute from 1946 to 1974. The Republic of China (ROC) officially created the line in 1947, which the People’s Republic of China (PRC) then adopted in 1949. Although the PRC claims sovereignty over all of the disputed islands and features, it remains silent on what specific waters the line claims. Based on ROC national archival files on the line, which remain virtually unused by scholars on the dispute, this article argues that the line was an “islands attribution” boundary until at least 1974. It claimed only the islands, features, and any adjacent waters consistent with contemporary conceptions of international maritime law. The article concludes with the present-day significance of this history and suggestions for future avenues of scholarship.