Everyone knows coral reefs are found in the ocean, but would you expect to find one in a river? The Amazon River is of course the largest river in the entire world, and there was a rather enormous coral reef found in the river. Can you believe that? I would love to take a dive down there and see it. However, it is of course in the river, so that means that the water is going to be quite murky. The coral reef would be difficult to find, so that’s why they are just now discovering it’s there. Would you believe that it’s 600 miles long?