Ujjayini (Ujjain) is situated on the Kshipra River in Madhya Pradesh, not the Ganga River. This significant religious and historical city is renowned for the Mahakaleshwar Jyotirlinga, one of the twelve Jyotirlingas dedicated to Lord Shiva. Conversely, Rishikesh, Kashi (Varanasi), and Haridwar are all spiritually important Hindu cities located along the Ganga River.