Partially inspired by the pond in geomorph 4c, and partially by the latest Harry Potter movie, this geomorph features a small underground lake. But none of the caves entering the geomorph actually can see the main lake – just a shore of it. You have to go underwater to get to the central location and the island with the strange statue of a forgotten god.

Geomorph 4f
I’m sorta having trouble parsing this one. I think I understand what the underwater part is, but it still feels a bit unclear.
(Also, there’s a fun underwater-cave-swimming part near the end of The 13th Warrior, I seem to recall.)
A lite or dashed cross-hatching in the “solid” parts?
I get what is going on, but I think Norman’s idea to incorporate some kind of way to distinguish the sections of the lake with no air above the surface from the sections that you could swim on the surface in would be a good idea.
I actually printed it out and used some crayons to color in the different areas — grey for the rock, blue for the water, and red/orange for the sand/corridors.
Once I got the different areas colored, I can see it much better, even in the black & white version.