The Vilayet of Salonica (Ottoman Turkish: ولايت سلانيك‎, Vilâyet-i Selânik, Selanik Vilayeti) was a first-level administrative division (vilayet) of the Ottoman Empire from 1867 to 1912. In the late 19th century it reportedly had an area of 12,950 square miles (33,500 km2). The vilayet was bounded by the Principality (later Kingdom), of Bulgaria on the north; Eastern Rumelia on the northeast (after the Treaty of Berlin); Edirne Vilayet on the east; the Aegean Sea on the south; Monastir Vilayet and the independent sanjak of Serfije on the west (after 1881); the Kosovo Vilayet on the northwest.