It is composed of 7 provinces.
Get a map of Venice with the water bus routes. You can see major parts of the city just by getting on and traveling the canals around the major islands. Just sit in St Marks Square and watch the pidgeons, listen to the music, watch the people go by. The Venitian glass is beautiful. We felt we were in a museum when we went to look at them. Be careful about the time of year you go to see Venice. It is under water some times. Planks are put out to walk when the sidewalks are not walkable. If you go the right time of the year, it is a beautiful city and well worth the trip.