Danube vilayet
The Vilayet of the Danube or Danubian Vilayet (Ottoman Turkish: ولايت طونه, romanized: Vilâyet-i Tuna; Bulgarian: Дунавска област, Dunavska(ta) oblast, more commonly Дунавски вилает, Danube Vilayet) was a first-level administrative division (vilayet) of the Ottoman Empire from 1864 to 1878. In the late 19th century it reportedly had an area of 34,120 square miles (88,400 km2).