Indira Gandhi Canal
The Indira Gandhi Canal (originally, Rajasthan Canal) is the longest canal in India. It starts at the Harike Barrage near Harike, a few kilometers downriver from the confluence of the Satluj and Beas rivers in Punjab state, and ends in irrigation facilities in the Thar Desert in the northwest of Rajasthan state. Previously known as the Rajasthan Canal, it was renamed the Indira Gandhi Canal on 2 November 1984 following the assassination of Prime Minister Indira Gandhi. The canal consists of the Rajasthan feeder canal with the first  in Punjab and Haryana state and a further  in Rajasthan. This is followed by the  of the Rajasthan main canal, which is entirely within Rajasthan. The canal enters Haryana from Punjab near Lohgarh and runs through the western part of the Sirsa district before entering Rajasthan near Kharakhera village in the Tibbi tehsil of the Hanumangarh district. It traverses seven districts of Rajasthan: Barmer, Bikaner, Hanumangarh, Jaisalmer, Jodhpur, and Sriganganagar. The main canal is  long, which is 1458 RD (reduced distance). From 1458 RD, a  long branch starts, known as the Sagar Mal Gopa Branch or the SMGS. From the end point of SMGS, another 92-kilometer-long sub-branch starts, the last of the Baba Ramdev sub-branch. It ends near Gunjangarh village in Jaisalmer district. Design and construction 
The idea of bringing the waters from the Himalayan Rivers flowing through Punjab and into Pakistan was conceived by hydraulic engineer Kanwar Sain in the late 1940s. Sain estimated that  of desert land in Bikaner and the northwest corner of Jaisalmer could be irrigated by the stored waters of Punjab rivers. In 1960, the Indus Water Treaty was signed between India and Pakistan, which gave India the right to use the water from three rivers: the Satluj, Beas and Ravi. The proposed Rajasthan Canal envisioned use of  of water. The initial plan was to build the canal in two stages. Stage I consisted of a  feeder canal from Harike barrage, Firozpur, Punjab to Masitawali (Hanumangarh) with the main canal of  from Masitawali (Hanumangarh) to Pugal, (Bikaner) in Rajasthan. Stage I also included constructing a distributary canal system of about  in length. Stage II involved constructing a  long main canal from Pugal (Bikaner) to Mohangarh (Jaisalmer) along with a distributary canal network of . The main canal was planned to be  wide at the top and  wide at the bottom with a water depth of . It was scheduled to be completed by 1971. The canal faced severe financial constraints, neglect and corruption. In 1970 the plan was revised and it was decided that the entire canal would be lined with concrete tiles. Five more lift schemes were added and the flow command of Stage II was increased by . With increased requirements, the total length of main, feeder and distribution canals was about . Stage I was completed in 1983 around 20 years behind the completion schedule. Effect on the region

 
  
After the construction of the Indira Gandhi Canal, irrigation facilities were available over an area of  in Jaisalmer district and  in Barmer district. Irrigation had already been provided in an area of  in Jaisalmer district. Mustard, cotton, and wheat now grow in this semi-arid northwestern region, replacing the soil there previously. However, many dispute the success of this canal in arid regions and question whether it has achieved its goals. 