"The Cortica River is a medium-sized river that flows eastard from its source in northeastern Brazil. It merges with the Amazon at longitude 53° west, which then empties into the Atlantic. Its location means that the Cortica River's ecosystem is very similar to that of the Amazon. Even in Brazil, where the rivers are being actively developed, there are parts of the river basin that have never been explored. There was a sensationn when ancient ruins were discovered there two or three years ago."