Behind only the Amazon, this river's volume discharge is the largest in the world, despite only being the ninth longest river in the world. The giant tigerfish, considered by many fishermen (citation needed) to be the toughest freshwater game fish to land on Earth, is endemic to this river and its tributaries. Kinshasa and Brazzaville lie across from one another on the banks of this river. Identify this African river which is most notable for a maximum depth of over 700 feet, the deepest river on Earth.
Congo River