A new reef system has been found at the mouth of the Amazon River, the largest river by discharge of water in the world. As large rivers empty into the world's oceans in areas known as plumes, they typically create gaps in the reef distribution along the tropical shelves—something that makes finding a reef in the Amazon plume an unexpected discovery.

Full article: http://news.uga.edu/releases/article/new-reef-system-at-mouth-of-amazon-river-0416/