Answer:
Elburz Mountains in the north, and the Zagros Mountains along its western borders
Step-by-step explanation:
The rugged terrain of Iran has offered advantages and disadvantages. The advantage of such terrain is that it is very hard to attack the country. In history, most people did not go to war around the mountains in Iran because they were practically impassable. The disadvantages that these mountains pose are that Iran found it very hard to go to war because of the logistics problems from those mountains. It is very hard to move supplies across them. It was also very hard to rule over such a country dominated by mountains.