Introduction to the Okba Mosque: The Okba Mosque (Grand Mosque), also known as the "Grand Mosque", is the second largest mosque in the world and the oldest and largest mosque in North Africa, together with Mecca and Mecca. Dina and Jerusalem are equally famous, and are also known as the four major mosques in the world. They are the most important monuments of Islam in the history of world architecture. This mosque was built almost at the same time as the city of Kairouan. It has a history of more than 1,300 years. It is 130 meters long, 80 meters wide, and the 4-meter-high courtyard wall makes it look like a majestic castle. It is simple, thick and magnificent. .