The only suggestion off the top of my head is some sort of stroke along the land/sea boundary or a more distinctive texture for one or the other to help separate the two. The 3d effect afforded by the highlight and drop-shadows on the badges in the ocean strikes me as somewhat jarring, given the context of the rest of the map. Perhaps toning down the white glow behind the text (more of a taupe color, perhaps) would probably make it settle better onto the map as well.