The dashed red line outlines China’s claim. Needless to say, Brunei, Indonesia, Malaysia, the Philippines, Taiwan, and Vietnam differ with China’s creative interpretation.

In recent years, satellite imagery has shown China’s increased efforts to reclaim land in the South China Sea by physically increasing the size of islands or creating new islands altogether. In addition to piling sand onto existing reefs, China has constructed ports, military installations, and airstrips—particularly in the Paracel and Spratly Islands, where it has twenty and seven outposts, respectively.
Global Conflict Tracker
Never mind that Beijing’s claims are fundamentally incompatible with established international law on maritime boundaries, the United Nations Convention on the Law of the Sea, which China has ratified and by which it professes to abide. Never mind, as well, that the claims have been ruled fraudulent by an international tribunal in The Hague.
ForeignPolicy.com