An irrigation system formed by tunneling into a hillside to find a water-bearing formation, and then channeling the water out of the hill to the surface for use in irrigation. Much of the water used in the plateau regions of Iran, for example, is brought into use in this way.


The collection of Islamic scriptures. It is made up of 114 sections that are believed to have been revealed verbatim to Muhammad over a period of time through the angel Gabriel.