It's reification. Treating concepts like they're real things. If human beings were suddenly wiped off the planet, there wouldn't be countries. But we go through all sorts of incredible machinations to put concreteness on things that are inherently not concrete. Look at a picture of the Earth taken from a satellite. Do you see the lines that make up the borders around countries, regions, states, cities? Are the oceans divided up? If you hadn't been told about concepts like these, you wouldn't see them as split up into individual land areas. You would see them for what they are: A bunch of land, and a bunch of water.
Anything else is patently absurd and, dare I say, delusional.
Am I trying too hard? Too hard to do what? State the obvious?