The South China Sea is a marginal sea that is part of the Pacific Ocean, encompassing an area from the Karimata and Malacca Straits to the Strait of Taiwan of around 3,500,000 square kilometres (1,400,000 sq mi). The area's importance largely results from one-third of the world's shipping sailing through its waters and that it is believed to hold huge oil and gas reserves beneath its seabed.China has been rapidly piling sand onto reefs in the South China Sea, creating seven new islets in the region. It is straining geopolitical tensions that were already taut.
The speed and scale of China’s island-building spree have alarmed other countries with interests in the region. China announced in June that the creation of islands — moving sediment from the seafloor to a reef — would soon be completed. Since then, China has focused its efforts on construction. So far it has constructed port facilities, military buildings and an airstrip on the islands, with recent imagery showing evidence of two more airstrips under construction. 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.
