An estuary. is a partly enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. Estuaries form a transition zone between river environments and maritime environments.
The features of an estuary are determined by a region's geology, and influenced by physical, chemical, and climatic conditions.For example, movements in the Earths crust elevate or lower the coastline, changing the amount of seawater that enters an estuary from the ocean.he amounts of seawater and fresh water flowing into an estuary are never constant. The quantity of seawater in an estuary changes with the changing tides, and the quantity of fresh water flowing into an estuary increases and decreases with rainfall and snowmelt.
An estuary is the mouth of a river or part of a river that is below  sea level that has freshwater at low tides and salt water at high  tides.They are usually enclosed and â¦ sometimes when water rushes in  with the high tide it can create a tidal bore, or a wave, that will  keep going until its energy is spent.alt marsh. Well, the question is asking for an example of  an estuary, not the definition. You can find that in a dictionary.  An example would be the Mississippi River be â¦ cause it flows into an  ocean, and since it is bigger than most estuaries, it is easier to  find thing and study it.