The correct answer is option 4, Sambhar. Sambhar Lake is located in the state of Rajasthan, India, and is known for its salt production. It is the largest inland saltwater lake in India and is a major source of salt for the country. The lake is shallow and saline, making it ideal for salt production. The water of Sambhar Lake is collected and evaporated, resulting in the crystallization of salt. This salt is then harvested and processed for various uses, such as cooking and industrial purposes.

Option 1, Barapani, is also known as Umiam Lake and is located in the state of Meghalaya, India. It is a man-made reservoir and is primarily used for hydropower generation and tourism.

Option 2, Kolleru, is a freshwater lake located in the state of Andhra Pradesh, India. It is a significant habitat for various species of birds and is also used for aquaculture.

Option 3, Loktak, is a freshwater lake located in the state of Manipur, India. It is the largest freshwater lake in Northeast India and is known for its floating islands called phumdis. The lake plays a crucial role in the socio-economic and cultural aspects of the