Bhakra Nangal Project is built on the Sutlej River.

The Bhakra Nangal Project is a multipurpose river valley project located in the northern Indian states of Himachal Pradesh and Punjab. It is one of the largest and most successful irrigation and hydroelectric projects in India. The project was conceived and implemented by the Government of India for the purpose of harnessing the water resources of the Sutlej River.

Here is a detailed explanation of the answer:

1. Introduction:
The Bhakra Nangal Project is a major engineering feat that involves the construction of a dam, powerhouses, and a network of canals. It was constructed to address the water and power needs of the states of Punjab, Haryana, and Rajasthan.

2. Location:
The project is situated on the Sutlej River, which is one of the five rivers that flow through the region of Punjab. The Sutlej River originates in Tibet, flows through Himachal Pradesh and Punjab, and eventually merges with the Indus River in Pakistan.

3. Purpose:
The main objectives of the Bhakra Nangal Project are:
- Irrigation: The project provides water for irrigation in the states of Punjab, Haryana, and Rajasthan. The canals constructed as part of the project distribute water to vast agricultural lands, helping in increasing agricultural productivity.
- Hydroelectric power generation: The project has several powerhouses that generate a significant amount of electricity. The hydroelectric power generated is used for domestic, industrial, and agricultural purposes.
- Flood control: The dam built as part of the project helps in controlling the flow of the Sutlej River, thereby preventing floods downstream and protecting the surrounding areas.

4. Construction:
The construction of the Bhakra Nangal Project began in 1948 and was completed in 1963. The project involved the construction of the Bhakra Dam, which is one of the highest gravity dams in the world. The dam is 741 feet high and spans across the Sutlej River, forming the Gobind Sagar reservoir.

5. Benefits:
The Bhakra Nangal Project has brought immense benefits to the region. It has transformed the agrarian landscape by providing a reliable irrigation system, leading to increased agricultural production. The project has also played a crucial role in the industrial development of Punjab and Haryana, as it supplies a significant amount of electricity to these states.

In conclusion, the Bhakra Nangal Project is built on the Sutlej River and serves the purpose of irrigation, hydroelectric power generation, and flood control. It has been a significant contributor to the development of the region and has positively impacted the lives of millions of people.