Montecristo (Italian pronunciation: [monteˈkristo]; also Monte Cristo), formerly Oglasa (in Ancient Greek: Ὠγλάσσα Ōglassa), is an island in the Tyrrhenian Sea and part of the Tuscan Archipelago. Administratively it belongs to the municipality of Portoferraio in the province of Livorno, Italy. The island has an area of 10.39 km² (4.01 sq mi) and is approximately 4.3 km (2.7 mi) wide at its widest point; the coasts are steep, and extend for 16 km (9.9 mi).