In addition to the map not making any goddamn sense to the poor translation...
Why, oh gods of the North WHY, does every Japanese map put a bunch of perfectly symmetrical mountains in the middle of the ocean?!
Nobody sees those as bodies of water when you draw Mount Saint Helens (before 1982) in the middle of it.
I mean, it kinda looks like Mt Fuji, with a bunch of mini-Fuji-kuns, but really it's just mountains in the water....