The countrywide demonstrations, involving people from different walks of life, began at 9 a.m. local time (0530 GMT).
People in capital Tehran, more than 1,000 other cities and towns, and in 4,000 villages have attended the rallies with flags of Iran and banners in support of the Islamic Republic.
In the capital, enthusiastic demonstrators marched across 10 main routes to reach the Azadi (Liberty) Square to cherish the memory of the Islamic Revolution victory.
Hundreds of foreign guests, including scientific, political, and influential figures from the European, African, Asian, and American countries have travelled to Iran to witness the event, which is also a great opportunity for reporters.
More than 6,000 cameramen and journalists, including 250 foreigners, cover the massive rallies in Tehran and other cities.
High-ranking Iranian officials have also attended the rallies along with other people to rejoice at the auspicious ceremony.
The crowd of demonstrators in the rallies paid tribute to the late founder of the Islamic Republic, Imam Khomeini, under whose leadership the revolutionary movements triumphed over the despotic regime of Pahlavi on February 11, 1979.
Imam Khomeini had lived many years in exile, in Iraq and France, before returning home and leading a historical revolution that overthrew Pahlavi regime.
The 10-day period from the return of Imam Khomeini until the revolution’s victory is celebrated annually in Iran, and is known as the Ten-Day Fajr (Dawn).
People also chanted anti-US and anti-Israel slogans during the mass rallies.
This year’s rallies have seen more anti-US sentiments given US President Donald Trump’s outspoken criticism of Iran and his executive order banning Iranian people from entering the US.
