From time to time you can find parts of the river Saale in the city. Of course there are the well known banks of the river, but there are also many creeks going through the city.
Even thus the river is everywhere in the city, in recent times there have been no floodings in the city.
To do a romantic trip you can either rent a boat or do a ship trip on the river. Also a picnic near the river is always a good idea.