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An international team of scientists has a huge coral reef in the Amazon River. The team from the universities of Georgia in the USA and Rio de Janeiro in Brazil on an expedition to more about Amazon River plumes when it the discovery. Plumes the areas close to where a river the sea and the river's freshwater with the saltwater of the ocean. The reef system an area of 5,800 square kilometres, stretching from the coast of French Guiana to the rainforest of the Brazilian state of Maranhao. The finding has surprised marine biologists because reefs rarely in large rivers as the water is usually too muddy and dark, and does not contain enough salt.

The scientists only 10 per cent of the reef. They there were many sponges, creatures and other marine life that had to life in the darker waters. They also 73 species of reef fish, many of them carnivorous. Researcher Dr. Patricia Yager about what she had . She said: "We brought up the most amazing and colorful animals I have ever on an expedition." Sadly, not all news about the reef is good. The whole area has earmarked for oil exploration. Dr Yager that: "From ocean acidification and ocean warming to plans for offshore oil exploration right on top of these new discoveries, the whole system at risk from human impacts."