What do you do at an estuary?

estuaries are places where it is half salt water and half fresh water it is important because salt water has more minerals and fresh water has more oxygen so it is kind of like the best of both...

they are expanding tidal mouths of riversUsually defined as where a river enters the sea, but a similar feature may be found much less commonly, on a lake shore. An Estuary (estuarine as an...

Estuaries are found mainly along coastal regions, in the areas before a river(s) drain into the ocean.

Yes

They do change from erosion etc.