There is no Kurdish area in north of Iran
There are approximately 4 million Kurds in Iran. They are the third most important ethnic group in the country after the Persians and Azarbaijanis and account for about 9 percent of the total population. They are concentrated in the Zagros Mountain area along the western frontiers with Turkey and Iraq and adjacent to the Kurdish populations of both those countries
http://countrystudies.us/iran/40.htm