​MONTECRISTO, (anc. Oglasa), an island of Italy, belonging to the province of Leghorn, 25 m. S. of Elba. Its highest point is 2126 ft. above sea-level, and its area about 6 sq. m. It contains the ruins of a Camaldulensian monastery, founded in the 13th century and destroyed in the 16th, and is the private property of the king of Italy, who has a shooting-lodge there. The fame of the island is due to the novel, Le Comte de Montecristo, by the elder Dumas.