The archipelago sprawls across roughly 425,000 square kilometers of the South China Sea, though the total naturally occurring land area is a mere 177 hectares, expanding to about 200 hectares with reclaimed land. The islands are cays: sand formations built on old, degraded coral reefs. The northeast section, aptly named Dangerous Ground, is characterized by low islands, sunken reefs, and degraded atolls where coral rises abruptly from ocean depths exceeding a thousand meters. Navigation here has always been treacherous. The islands contain almost no arable land, no indigenous population, and very few have any natural supply of fresh water. Their value lies not in what sits above the waterline, but in the fishing grounds, shipping lanes, and potential hydrocarbon deposits that surround them.

Each claimant administers its occupied features under different political frameworks. Brunei includes its claimed portion within its exclusive economic zone. China places the islands under Sansha, a prefecture-level city in Hainan Province. Malaysia administers its features as part of Sabah state. The Philippines created the Municipality of Kalayaan within Palawan Province. Taiwan assigns its holding, Taiping Island, to Kaohsiung municipality. Vietnam governs its occupied features as Truong Sa district of Khanh Hoa Province. The result is a patchwork of competing jurisdictions overlaying the same waters, with garrisons sometimes within visual range of each other.

In the nineteenth century, Europeans found Chinese fishermen from Hainan making annual sojourns to the Spratlys. Vietnamese and Malay fishermen also used the islands seasonally. Permanent military occupations began only in the twentieth century, accelerating after World War II when Japan surrendered its wartime holdings. France and Japan had both staked claims before the war, and after it, newly independent nations rushed to assert sovereignty. The pace of conflict quickened in the 1970s and 1980s. South Vietnam seized features from the Philippines and Taiwan. China occupied its first Spratly reef in 1988, clashing with Vietnam at Johnson South Reef in an engagement that killed more than sixty Vietnamese sailors. The 1990s brought China's occupation of Mischief Reef, alarming the Philippines and signaling a more assertive strategy.

The Philippines brought its dispute with China to the Permanent Court of Arbitration in 2013, invoking the United Nations Convention on the Law of the Sea. The tribunal's July 2016 ruling was sweeping: it found that China had no legal basis for historic rights within its nine-dash line, that several occupied features were low-tide elevations or rocks incapable of sustaining habitation, and that Chinese activities had caused severe environmental harm to coral reef ecosystems. China rejected the ruling entirely, calling it "ill-founded." None of the other claimants has submitted to binding arbitration, leaving the legal landscape uneven. The ruling gave smaller nations a moral and legal framework but no mechanism for enforcement.

From the air, the Spratlys reveal a jarring contrast. Natural cays barely rise above the waterline, their pale sand fringed by reef. Nearby, artificial islands display the geometry of military infrastructure: runways, harbor walls, radar domes, and weapons emplacements. China's land reclamation program, sometimes called the "Great Wall of Sand," transformed seven reefs into fortified bases between 2013 and 2016. Vietnam, Taiwan, and the Philippines have also reinforced their holdings, though on a far smaller scale. The ecological cost has been enormous. Dredging destroyed coral reefs that supported fisheries the region's coastal communities depend on. The irony is stark: the competition to control resources may be destroying the resources themselves.