The South China Sea is not exclusively China's sea, despite its name. It is a major body of water bordered by several countries, including China, Vietnam, the Philippines, Malaysia, Brunei, and Taiwan. Many of these countries have overlapping territorial and maritime claims in the area.
China has claimed a large portion of the South China Sea through the "Nine-Dash Line," but this claim is disputed by other nations and was ruled to have no legal basis by an international tribunal in 2016 under the United Nations Convention on the Law of the Sea (UNCLOS). Despite the ruling, China continues to assert its claims, leading to ongoing tensions and disputes in the region.