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This is one of the first designs I made to test my knowledge of the edge-river method (ERM), an extension of disk-river packing for non-uniaxial designs (explanation by Mu-Tsun Tsai).
At the time, I couldn’t figure out how to fill in peninsulas if they weren’t touching the backside lakes (dark blue, areas hidden under normal lakes), and I didn’t feel like dealing with Pythagorean stretches, so there’s room for optimization, but whatever.
As this was one of my first designs, it ended up being quite difficult to collapse, and I estimate spending 4 hours trying to attack it before it collapsed. Even then, the bottom-left vertical line could use some improvement.