Danube Province, Ottoman Empire
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The Danube Province (Turkish: Tuna Vilayeti) was a vilayet of the Ottoman Empire from 1864 to 1878. The vilayet was created as part of Ottoman administrative reforms of 1864 from the northern parts of Silistria Province along the Danube River. It included the northern part of what is now Bulgaria (including Southern Dobruja) as well as the Romanian region of Northern Dobruja. The vilayet was subdivided into the sanjaks of Ruse (Rusçuk), Sofia (Sofya), Tarnovo (Tırnovo), Tulcea (Tulça), Varna, and Vidin. It was incorporated into Bulgaria and Romania in 1878.