Which of the following is an area where fresh and salt water meet and mix?

A) lake
B) river
C) estuary
D) stream
E) pond

An estuary is a partially enclosed body of water where freshwater from rivers and streams mixes with saltwater from the ocean. It is a highly productive ecosystem that serves as a critical habitat for many species of fish, birds, and other wildlife. Therefore, the area where fresh and saltwater meet and mix is an estuary, not a lake, river, stream, or pond.