It is the shoreline. I was not sure whether to rotate it to make it look level just for appearances.
Unluckily, the color is owed to heavy environmental pollution. These days, most of the time, we live under a heavy cloud of fine dust blowing over from China. That day it had cleared up somewhat, but the light was still strange.
You are right, Chuck, I should crop the image.
Thank you all for the comments.
