Unlike other historic Islamic cities, where the most expensive goods were sold near the city's main mosques, the geographic organization of specialized trades in the permanent souks of Marrakesh was not necessarily dependent on the location of important mosques.[14] Instead, the souks are organized across a vast area stretching between Jemaa al-Fnaa to the south and the Ben Youssef Mosque to the north. Some of the souks are (or historically were) housed within their own structural complex called a kissaria or qaysariyya.