Hmmm interesting. So that's the north and south pacific and Atlantic. Presumably the Indian and Mediterranean, what's the seventh???

I've been keeping track of actual seas I've come close enough to put a toe in. I think I've got the Irish Sea, the North Sea, the Baltic, the Mediterranean, the Sea of Marmara, the Dead Sea, the Sea of Eilat, the Red Sea and the Coral Sea. I'll have to additionally look up what the body of water around boracay island in the Philippines was.