The correct answer is Nagarjuna Sagar. Explanation & Key Takeaways: • Nagarjuna Sagar Dam is built across the Krishna River between the states of Telangana and Andhra Pradesh in India. • It is one of the largest and tallest masonry dams in the world, standing at a height of approximately 124 meters (407 feet). • The construction of the Nagarjuna Sagar Dam started in 1955 and was completed in 1967, making it one of the earliest major irrigation projects in India. • This dam plays a crucial role in providing irrigation water to the arid regions of Telangana and Andhra Pradesh, benefiting millions of farmers. Related Concepts: • Sardar Sarovar Dam • It is constructed on the Narmada River in the state of Gujarat, India. • The dam is a part of the Narmada Valley Project, which aims to provide water for irrigation, drinking, and hydroelectric power generation. • It is one of the largest dams in the world in terms of volume and surface area. • Indira Sagar Dam • It is constructed on the Narmada River in the state of Madhya Pradesh, India. • The dam is primarily used for irrigation and hydroelectric power generation. • Indira Sagar Dam has one of the largest reservoirs in India in terms of water storage capacity. • Hirakud Dam • It is constructed on the Mahanadi River in the state of Odisha, India. • Hirakud Dam is one of the longest dams in the world, stretching over 25.8 kilometers (16 miles). • The dam provides irrigation, flood control, and hydroelectric power generation. • Krishna River • The Krishna River is one of the major rivers in India, flowing through the states of Maharashtra, Karnataka, Telangana, and Andhra Pradesh. • The river is around 1,400 kilometers (870 miles) long and is a crucial water source for agriculture, drinking water, and industrial use in the region. • Several major dams and reservoirs, including Nagarjuna Sagar Dam, Srisailam Dam, and Almatti Dam, have been constructed on the Krishna River to harness its water resources.