French Island is a term that can refer to three different islands in the Mediterranean Sea. CORSICA is a French island located off the coast of Italy, with an area of 8, 680 square kilometers and a population of over 300, 000 people. REUNION is another French island located in the Indian Ocean, with an area of 2, 512 square kilometers and a population of over 800, 000 people. Lastly, Ile is a small French island located off the coast of Brittany, with an area of only 0.4 square kilometers and a population of just over 100 people.