There's more than one place called '''Azarbaijan''' or '''Azerbaijan''':
'''Azerbaijan''' (Republic of Azerbaijan) - the country, in the Caucasus region of Asia
Azerbaijan (Iran) (Azarbaijan) - a region in the north of the country
East Azerbaijan (East Azarbaijan) - a province in Azerbaijan (Iran)
West Azerbaijan (West Azarbaijan) - a province in Azerbaijan (Iran)