Monte Cristo is a small Italian Island , approximately 4.3 kilometers across at its widest point , located about halfway between Corsica and mainland Italy ; south of Elba and west of Giglio . Montecristo is a small Italian islet , approximately 4.3 kilometers ( 2.3 mi ) across at its widest point , located about halfway between Corsica and mainland Italy ; south of Elba and west of Giglio .