Cusco, also spelled Cuzco, is a department of Peru. It is the fourth-largest in the country, after Madre de Dios, Ucayali, and Loreto, and borders the departments of Ucayali on the north; Madre de Dios and Puno on the east; Arequipa on the south; and Apurímac, Ayacucho and Junín on the west. It is administered by a regional government. Its capital is Cusco, the historical capital of the Inca Empire.