South China Sea Arbitration

The South China Sea Arbitration (Philippines v. China, PCA case number 2013–19) was an arbitration case brought by the Republic of the Philippines against the People's Republic of China (PRC) under Annex VII (subject to Part XV) of the United Nations Convention on the Law of the Sea (UNCLOS, ratified by the Philippines in 1984, by the PRC in 1996, opted out from Section 2 of Part XV by China in 2006) concerning certain issues in the South China Sea, including the nine-dash line introduced by the mainland-based Republic of China since as early as 1947.

Source: Wikipedia — South China Sea Arbitration (CC BY-SA 4.0)