Taking photographs in a thick swamp is completely different than open marshes. Trying to find a single point to make the focus of the image is impossible. The trees, undergrowth, and colored water can all blend together.
The shot above is a lake, in the center of a swamp.
Most swamps in the US are fairly small compared to the land around them. This, 4 holes swamp, is one of the largest. If you actually tried to walk through, with no path, a person would be lost within a short distance.
These photographs were created in less than a high resolution yet enlarged the thick woods are unbelievable.
A little fact here: A swamp is an area that is covered with water yet has trees. A marsh has grass and reeds in the water. Both can run dry at times. If the area never runs dry reeds or trees will not grow. Than it’s a lake.
Which is why one of the images above is a lake, inside a swamp.