Yeah none of this makes any sense. I loved how faithful they were with previous regions, such as that desert in the middle of Manhattan.
Don't remind me. That is one of the reasons why Unova is so hated by many Pokemon fans, basing it geographically on a city instead of something much larger like a country or a large US state. Unova should have been based on New York state as a whole, instead of just New York City and Jersey City, and there should never have been a desert.