What conditions create an estuary?

An estuary is formed where freshwater from rivers and streams meets and mixes with saltwater from the ocean. This transition zone often occurs in coastal areas where tidal influences are present. Key conditions for estuary formation include a sheltered bay or river mouth, fluctuating water levels due to tides, and significant freshwater input from surrounding land. Additionally, sediment deposition and vegetation growth can help stabilize the area, further defining the estuarine environment.