Hey, @marc-allaria; a big hug!

I took this photograph in one of the estuaries of Anzoategui state, where I live, in Venezuela.

These places are colloquially called "mouths", because it is where a river joins the ocean, or rather where it "empties", in this case it is the Unare River that mixes with the Caribbean Sea. This site is considered as an observatory of birds because of the number and diversity of birds that are concentrated there.

In the photo you can see a Red Heron (here they call it "Coro cora") and a "Cotua", flying together just above the junction between the sea and the river.

There the color of the Sea has the peculiarity of being brown because it adopts the tone of the river water and they are also turbid waters, with a lot of waves, that keep the sand agitated.

^{I used a Canon Rebel EOS T2i camera.}