I don't have a foolproof way to accurately identify Dragon Utopia based on views yet. Utopias aren't as large as they visually appear, but that's fine. What's even cooler is that the game can sink some cells of the Dragon Utopia into the terrain. Consequently, this creates a huge number of potential locations for Dragon Utopias. It seems almost impossible to make an accurate determination.
https://www.youtube.com/watch?v=fTp86O1oifs&index=8&list=PLVWnhnD87eqtRInhkEp57wXUaDXNMzxyH
I learned from Gom. Just so you know, the problem of Dragon Utopias sinking into the terrain is absent in HotA.
For example, in my last game, I found 2 out of 3 Dragon Utopias on the map by viewing. And even in a place I probably wouldn't have checked otherwise.