The Three Cities is a collective description of the three fortified cities of Cospicua, Vittoriosa, and Senglea on the Island of Malta, which are enclosed by the massive line of fortification created by the Knights of St John, the Cottonera Lines. "Cottonera" is usually taken to include these Three Cities and Kalkara.The first indication that this description is erroneous stems from the emblem that each city bears.