The Great Mosque of Kairouan (), also known as the Mosque of Uqba (), is a mosque situated in the UNESCO World Heritage town of Kairouan, Tunisia and is one of the most impressive and largest Islamic monuments in North Africa. This location corresponded originally to the heart of the urban fabric of the city founded by Uqba ibn Nafi. However given the natural lay of the land crossed by several tributaries of the wadis, the urban development of the city spread southwards. Human factors including Hilalian's invasions in 449 AH (1057 AD) led to the decline of the city and halted development. For all these reasons, the mosque which once occupied the center of the medina when first built in 670 is now on the easternmost quarter abutting the city walls.