Brain Post: 600-Mile-Long Coral Reef Discovered At The Mouth Of The Amazon River… A team of scientists from Brazil and the United States discovered an enormous coral reef that stretches for some 600 miles. The reef is located at the mouth of the Amazon River, where the water is tainted due to the mixing of saltwater and fresh water. The reef system spans 3,600-square miles along the ocean floor, stretching from French Guiana to […] Brains Chris Wallner | April 26, 2016 1 Comment