Explanation:

- The Kumbh Mela is a major Hindu festival that rotates among four sacred locations in India.

- Option 1: Ujjain - It is one of the sites where the Kumbh Mela is held. It is located on the banks of the Shipra River.

- Option 2: Haridwar - This city on the banks of the Ganges River is another location for the Kumbh Mela.

- Option 3: Prayagraj - Formerly known as Allahabad, it is a significant site for the festival, located at the confluence of the Ganges, Yamuna, and mythical Saraswati rivers.

- Option 4: Varanasi - Although a major religious center, Varanasi is NOT one of the four locations for the Kumbh Mela.

Option 4: Varanasi