The Murray River holds a dark spot in its history.
Heavy rainfalls in 1956 led to flooding, which caused severe damage across its basin. It is still considered the greatest catastrophe of Southern Australia.
In 2011, researchers discovered two new species of freshwater stingrays in the Amazon River.
The Heliotrygon (rosai and gomesi), commonly referred to as the Pancake stingrays, is the first new genus of stingrays from the Amazon described since 1987.