What China Has Been Building in the South China Sea

China has placed runways and radar facilities on new islets in the South China Sea, built by piling huge amounts of sand onto reefs. The construction is straining already taut geopolitical tensions.

The speed and scale of China’s island-building spree in the South China Sea last year alarmed other countries with interests in the region. After announcing in June that the process of building seven new islands by moving sediment from the seafloor to reefs was almost done, China has focused its efforts on building ports, three airstrips, radar facilities and other military buildings on the islands. The installations bolster China’s foothold in the Spratly Islands, a disputed scattering of reefs and islands in the South China Sea more than 500 miles from the Chinese mainland.China’s activity in the Spratlys is a major point of contention between China and the United States, and has prompted the White House to send Navy destroyers to patrol near the islands twice in recent months.The new islands allow China to harness a portion of the sea for its own use that had been relatively out of reach. Although there are significant fisheries and possible large oil and gas reserves in the South China Sea, China’s efforts serve more to fortify its territorial claims than to help it extract natural resources, said Mira Rapp-Hooper, formerly the director of the Asia Maritime Transparency Initiative at the Center for Strategic and International Studies, a Washington research group. Though they are too small to support large military units, the islands will also enable sustained air and sea patrols, strengthening China’s influence in the area.