During the 31 years that the Italians remained in Leros, they set up a great plan to build and fortify the island, since its strategic position and its large natural harbours (the largest of which, Lakki, is the largest deep water harbour in the Mediterranean Sea), made it an ideal naval base. The fortification of Leros and the creation of a major naval base, ensured that the Italians had control over an area of vital interest to the Allies (the Aegean, the Dardanelles and the Near East). Mussolini, who called Leros "the Corregidor of the Mediterranean", saw the island as a crucial base for the Italian domination of the eastern Aegean Sea.