What is the area of maximum distribution of organisms on Earth?

Among the accumulation of a large number of species of living beings, one can note the forests near the Amazon River, where new species of animals and plants are still being discovered. No wonder, the hot and humid climate encourages the growth of plants, insects, birds and other animals. The largest accumulations of living organisms are inherent in areas remote from civilization. But it should be noted a place that contains a much larger number of organisms and this is the Great Barrier Reef, it is the largest natural object on Earth formed by living organisms.