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A colony of boulder brain coral (Colpophyllia natans), a species of stony brain coral found primarily in the Caribbean Sea and the Gulf of Mexico. It is characterised by large, domed colonies, which may be up to 2 m (6.6 ft) across, and by the meandering network of ridges and valleys on its surface. It is considered one of the dominant reef-building corals of the Caribbean region and is commonly found on shallower reef ledges and slopes.Photo: Nick Hobgood