I found the completed version of my Sea Dragon City map - Ryukyo (which means "dragon city" in Japanese).
And here's a link to the larger version of that file...
Ryukyo map
The real experiment in this map was to simulate the depth by using layers of 30-60% transparent rectangles of blue stacked between "lower" terrain layers, so the image gets darker, more blue, thus deeper until you can barely see the objects at the bottom.
Enjoy!
GP
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