Timbuktu (Archaic English: Timbuctoo; Koyra Chiini: Tumbutu; French: Tombouctou) is a city in Tombouctou Region, in the West African nation of Mali. It is home to the prestigious Sankore University an other madrasas, and was an intellectual and spiritual capital and centre for the propagation of Islam throughout Africa in the 15th and 16th centuries. Its three great mosques, Djingareyber, Sankore and Sidi Yahya, recall Timbuktu's golden age. Although continuously restored, these monuments are today under threat from desertification. Timbuktu is primarily made of mud.