Macclesfield Bank, Underwater reef in South China Sea.
Macclesfield Bank is a submerged atoll in the South China Sea that stretches approximately 130 kilometers from southwest to northeast and spans about 70 kilometers in width. The coral rim surrounds a central lagoon with a distinct depth difference from the outer structure.
British explorers conducted detailed surveys of the reef system in 1892 and 1893, establishing critical navigation data for the South China Sea. These early mapping efforts shaped modern understanding of the underwater structure in the region.
The reef system forms part of the Zhongsha Islands, which are administratively managed by China through Sansha city in Hainan Province. Local maritime traditions have long recognized this area as significant for navigation and resource management.
The reef requires careful navigation because the coral rim lies in relatively shallow water while the inner lagoon is substantially deeper. Visitors should understand this is a remote underwater location requiring specialized diving or boat equipment to explore.
The formation spans a particularly large area and is distinguished by its ring-shaped structure typical of atolls. The central lagoon connects to the outer ocean through passage systems that cut through the surrounding reef wall.
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