Explanation:

- Pushkar: Known for its holy lake, Pushkar is in Rajasthan, not Gujarat. It's a significant pilgrimage site but not associated with the Mauryas.

- Sudarshana: Built during the Mauryan period, Sudarshana Lake was an artificial reservoir in Gujarat. It played a crucial role in irrigation and agriculture.

- Loktak: This is the largest freshwater lake in northeast India, located in Manipur. It is unrelated to the Mauryan dynasty.

- Lonar: A lake in Maharashtra created by a meteor impact. Not related to the Mauryas and not in Gujarat.