The Middle East: a geographical study, Peter Beaumont, Gerald Henry Blake, John Malcolm Wagstaff, Wiley, 1976, ISBN 9780471061175, ... Although qanats with lengths of more than 50 km have been described from the Kerman region, it would seem that the vast majority are between one and five kilometres in length ...
African elites in India: Habshi Amarat, Kenneth X. Robbins, John McLeod, Mapin, 2006, ISBN 9781890206970, ... There is no doubt that the Iranians introduced this technique to the basalt parts of the Deccan, with adaptations to the local geology. In Iran, the qanat drains a layer of water within the rock of the foothills; in the basalt hills of the Deccan, it usually drains water-bearing fissures in the rock. The deepest qanat in India, and probably also the oldest, supplies the fort of Bidar ...
