Are There Any Saltwater Rivers?

No, there are no saltwater rivers. By definition, a river is a natural flowing watercourse—typically freshwater—that moves toward an ocean, sea, lake, or another river. Saltwater is found in oceans, seas, and estuaries (transitional zones where rivers meet the sea and fresh and salt water mix). While some rivers may have brackish sections near their mouths due to tidal influence, the river itself is fundamentally a freshwater system.