[Agrajag]

Thanks Edi!
I don't know why I didn't think of the test map myself :S
Just in case you were wondering, 2048 is indeed deep sea, 4096 is indeed cave, and border mountain is 4194304.
I'm not really sure what happens in between, but I'm guessing it's not really relevant, since my randomizer probably won't use anything beyond 2048 (there won't be caves nor border mountains. At least not in the foreseeable future.)