The correct answer is option 4, Rajasthan. Sambhar Salt Lake is one of the largest salt lakes in India and is located in the state of Rajasthan. It is situated approximately 80 kilometers southwest of the state capital, Jaipur. Sambhar Salt Lake is a unique geographical feature as it is surrounded by the Aravali hills and receives water from several seasonal rivers. The lake has been a major source of salt production for centuries and is known for its pristine white salt flats. It is also home to a variety of bird species and is a popular site for birdwatching. Additionally, Sambhar Salt Lake is an important tourist attraction and offers opportunities for photography, wildlife observation, and exploring the local culture and heritage.