The Vilayet of Kosovo (; ; ; Macedonian: Косовски вилает, Kosovski vilaet; Serbian: Косовски вилајет, Kosovski vilajet) was a first-level administrative division (vilayet) of the Ottoman Empire in the Balkan Peninsula which included the current territory of Kosovo and the western part of the Republic of Macedonia. The areas today comprising Sandžak (Raška) region of Serbia and Montenegro, although de jure under Ottoman control, were in fact under Austro- Hungarian occupation from 1878 until 1909, as provided under Article 25 of the Treaty of Berlin. Uskub (Skopje) functioned as the capital of the province and the mid way point between Constantinople and its European provinces. Uskub's population of 32,000 made it the largest city in the province, followed by Prizren, also numbering at 30,000.