The Great Mosque of Kilwa is a historic mosque located in Kilwa Kisiwani, an island off the coast of Tanzania. Built in the late 11th century, it is one of the oldest and most significant Islamic structures in East Africa. The mosque features coral stone walls and intricate architectural designs, reflecting the influence of Arab and Swahili cultures. The mosque served as a center for Islamic learning and worship, playing a crucial role in the spread of Islam in the region. It is part of the Kilwa archaeological site, which is recognized as a UNESCO World Heritage Site, highlighting its cultural and historical importance.