Correct Answer: Vembanad Lake

Solution : The correct answer is Vembanad Lake .

Vembanad is the longest lake in India. It is located in the state of Kerala, in the southwestern part of the country. Vembanad is renowned for its scenic beauty and is an important part of the local ecosystem. It is the longest lake in India and one of the largest in the state of Kerala. The lake is a significant source of livelihood for the communities living around it and supports a rich diversity of flora and fauna.