The Narmada Bachao Andolan (NBA) was a social movement against the construction of large dams on the Narmada River, particularly the Sardar Sarovar Dam in Gujarat. Led by Medha Patkar and others, it raised concerns about displacement, environmental impact, and rehabilitation. Tehri Dam is on the Bhagirathi River in Uttarakhand, Tawa Dam is in Madhya Pradesh, and Rihand Dam is in Uttar Pradesh.