In case you were wondering, I took this while flying this morning. I was approximately 15 miles southeast of the New Orleans International airport in New Orleans, LA.
All that you see in this photo was once dry land, except for the Mississippi River, which is the furthest waterway to the right side of the photo. All of the rest of this watery area is sinking land, due to a variety of reasons: Environmental, Industrial, and Corp of Engineers caused. (It is not newly flooded lands. This is the permanent condition of the landmass today.)
This once land -- now wetlands area reaches about 50 miles south to where it meets the Gulf of Mexico.
I thought you might find this interesting.