A river outlet is a place where a river meets the sea. An ESTUARY is a type of river outlet, where fresh water from the river mixes with salt water from the ocean. Estuaries are typically 7 letters long. A BAYOU is another type of river outlet, which is a slow-moving body of water that is usually found in a marsh or swamp. Bayous are typically 5 letters long. The final type of river outlet is the MOUTH, which is the end of a river where it flows into a larger body of water such as a lake or ocean. Mouths are also typically 5 letters long.