Well done; prize jackpot to the woman in the lowermost icon!

It's based on a map of Antarctica without the ice (http://en.wikipedia.org/wiki/Image:AntarcticaRockSurface.jpg):



As the caption says, this map does not take into consideration the fact that without the ice sea levels would be higher, but Antarctica, no longer weighed down by the weight of the ice, would rise up a long way itself.

james_nicoll mused (http://james-nicoll.livejournal.com/377153.html?thread=3821633#t3821633):

I bet if one deleted the map of the continental shelf, few people would recognise it.

So I did that, and rotated it to throw people off further, and it looks like he was right. :o)