A large number of waterwheels (known as norias, or sometimes saqiyyas) were located throughout the city's water network in order to assist in water distribution or to power certain industries.[1][2] Some of these were very large, such as the huge noria which supplied the Marinid royal gardens of Mosara, measuring 26 meters in diameter and 2 meters in thickness.[3] Only a few of these waterwheels have survived in some form, including some examples around the Jnan Sbil Gardens.[3][4]