Explanation:

- Ayodhya is a holy city located on the banks of the river Sarayu. It is famously associated with Hindu mythology, particularly as the birthplace of Lord Rama.

- Bhopal is situated around a series of lakes, including the Upper and Lower Lakes, but not on the river Sarayu.

- Kanpur is located on the banks of the river Ganges, not Sarayu.

- Haridwar is another city on the banks of the river Ganges, famous for the Kumbh Mela and its temples.