At the moment the route from Piombino to Bastia is the shortest there is. That is why it is also one of the cheapest. It is now only offered by the ferry company Corsica Ferries.
The ferry from Piombino to Corsica operates one of the shortest possible distances from the mainland of Italy to Corsica. The ferry from Piombino takes about 3 hours to the port city of Bastia.