Historical qanats or subterranean canals are scattered all around the province. the existence of these qanats are indicative of special water supply systems in the past. Although these qanatas have lost their main function during the last centuries and some of them have been destroyed, but presently they are accounted as old monuments of the province which are worth seeing. These old qanats are: Koorgeh and Jenar, Bibi, in the city of Ilam, Azluvar in the Ilam - Chalsera Road, Sarawatash, Falahati, Namdanan, Bilvar, Qamesh, Kalag, Galan, Vali Abad, Aseman Abad, Sarab Eyvan, and Amir Abad.