The South China Sea contains over 250 small islands, atolls, cays, shoals, reefs, and sandbars, most of which have no indigenous people, many of which are naturally under water at high tide, and some of which are permanently submerged. The features are grouped into three archipelagos (listed by area size), Macclesfield Bank and Scarborough Shoal:
South China Sea
The Spratly Islands
The Paracel Islands
The Pratas Islands
The Macclesfield Bank
The Scarborough Shoal
The Spratly Islands spread over an 810 by 900 km area covering some 175 identified insular features, the largest being Taiping Island (Itu Aba) at just over 1.3 km long and with its highest elevation at 3.8 metres.
The largest singular feature in the area of the Spratly Islands is a 100 km wide seamount called Reed Tablemount, also known as Reed Bank, in the northeast of the group, separated from Palawan Island of the Philippines by the Palawan Trench. Now completely submerged, with a depth of 20 m, it was an island until it sank about 7,000 years ago due to the increasing sea level after the last ice age. With an area of 8,866 kmē, it is one of the largest submerged atoll structures of the world.
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