It would be interesting to see the real numbers there, because a lot of big cities have "reclaimed" massive tracts of land from the oceans they butt up against, in addition to things like docks and piers and things deliberately built over top of otherwise open water.

Then there are house boats and whatnot, and even entire towns in some countries (SE Asia has more than a couple floating towns IIRC, though I don't remember where exactly)

Edit: I also don't count a city/town built at the base of a mountain, because that's just normal land. I'm talking more about the inaccessible peaks themselves. Some countries like China do that a lot more often than you see in, for example, the US, but I suspect most of that would be a wash overall.