The term 'WHERE A RIVER MEETS THE SEA' can be summarized as an ESTUARY, which is a 7-letter word. An ESTUARY is a partially enclosed coastal body of water where freshwater from rivers and streams mixes with saltwater from the ocean. Estuaries are important habitats for many species of fish, birds, and other wildlife. They also provide important economic benefits to humans, such as providing a safe harbor for ships and serving as a source of food.