Most mountainous I think. I'm pretty sure that is right.
I just did this lesson in my school, If there were world wide educators on the subject, and/or a clean environment.
I believe that would be Mesopotamia, the seat of the Sumerian and Akkadian civilizations.
Source: Studied this last week. :)
Answer:
Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.
