Question

The controversial dam across the river Narmada?

Answer 1

It's in the Indian state of Gujarat. This dam supplies electricity and water to four Indian states: Gujarat, Rajasthan, Maharashtra, and Madhya Pradesh. Since the foundation stone was laid by Prime Minister Jawaharlal Nehru in$1961$, the project has been credited to him.

Complete Explanation:
Sardar Vallabhbhai Patel, India's first deputy prime minister, had a vision for the Sardar Sarovar initiative. After conducting a report on the use of the Narmada river water that flowed through the states of Madhya Pradesh and Gujarat and into the Arabian sea, Pandit Jawaharlal Nehru laid the project's foundation stone on April $5$,$1961$.
The distribution of Narmada water among the three states of Gujarat, Maharashtra, and Madhya Pradesh was the subject of much debate in a project report for the dam. After failed talks, the Narmada Water Dispute Tribunal (NWDT) was formed in $1969$ to determine the project's fate.
On the project's benefits, union minister Nitin Gadkari said that "four crore Guajarati’s would get drinking water and $22,000$ hectares of land will be irrigated," and that "the dam would help PM Modi's dream of making poor farmers wealthy by $2022$ will be realized."
Prime Minister Narendra Modi has opened the Sardar Sarovar Dam on the Narmada River in honor of his ${67^{th}}$ birthday. The scheme, which has sparked much debate for decades, is said to be one of the world's largest dams. The dam, which spans $1.2$ kilometers and is $163$ meters deep, is planned to be owned by the three states of Madhya Pradesh, Maharashtra, and Rajasthan.

Sardar Sarovar Dam is the answer to this question.

Note:
The Sardar Sarovar Dam is located in Gujarat's Kevadiya district, and it is constructed over the Narmada River. Since it is constructed over the river Narmada, it is also known as the Narmada Dam. This dam is believed to be linked to the Narmada Bachao Andolan, which was opposed to the project.