http://www.xkcd.com/731/

Pretty awesome, eh?

Still, I have to wonder: just how many "desert islands" are there in 
existence that are just big enough for one person and a palm tree? And 
now many of them have that characteristic hump shape?

I'm going to go out on a limp and say zero. All the small islands I've 
seen are surrounded by shallow seas, not deep ones. You would think such 
sharp sides would tend to focus wave activity, leading to fairly rapid 
erosion until the island is underwater. (Also, the size of the island 
should vary with the tidy, presumably...)

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