The city known as canals is Venice.
The city that is known as the City of Canals is Venice, Italy. It is known by this name because it has so many beautiful canals running through it.
Venice in Italy is traditionally known as the city of canals.
The 'city of canals' usually refers to Venice, Italy.
Venice
Venice , Italy
Venice
Venice, Italy
That would have to be Venice, Italy.
canals and bridges
That would be Venice, Italy.
canals and bridges
Venice. (Though Birmingham, UK, has a greater length of canals).