If you mean the physical terrain, then no. That's a hardcode limitation.
However, GWX fixes the shape of some places, but it will still be the odd rectangular saw-tooth edge shoreline.
There are texturepacks which improve the look of terrain (B25's high-res mod is great).
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Career: Feb. 13, 1942 "Cpt. Johny Goodwood"
Porpoise class: USS Shark, SS-174
Patrols: 2
Victories: 1 Merchants (4519 GRT), 0 Warships (0 GRT), 0 Aircraft
Sunk with all hands lost.
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