There are two major ranges of mountains called the Alborz and the Zagros.
The Alborz has been extended all the way from Azerbaijan to Afghanistan passing through the southern part of the Caspian Sea.
The Zagros have covered a region from Azerbaijan to the west and SE of the country.
These two ranges function as walls blocking meteorological phenomena from entering inside central Iran. In addition to these ranges, there are mountainous regions in central and eastern Iran.
