Porto-Vecchio ( Porti Vechju in Corsu ) is a town and commune of the Corse-du-Sud department , on the island of Corsica , in France.Porto-Vecchio is the third largest town in Corsica after Bastia and Ajaccio.Porto-Vecchio is also a tourism city , tourists come from many countries around the world , in particular from Italy , Germany or the Netherlands . Porto-Vecchio has 10.000 inhabitants , that become 40.000 in the summer . Porto-Vecchio is a commune in the Corse-du-Sud department of France on the island of Corsica .